6 Best Industrial Snips for Trimming Steel Shims

Trimming steel shims with surgical precision is a daily requirement when leveling metal flashing or adjusting gaps in structural steel framing. When thin-gauge metal resists a clean cut, it leads to jagged edges that snag membranes and compromise moisture barriers. Choosing the right snips changes the job from a frustrating fight with sheet metal into a streamlined part of the installation process. Professionals know that the difference between a high-quality finish and a potential leak point often comes down to the quality of the blade and the leverage of the handle.

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Wiss M3R Aviation Snips: The All-Around Workhorse

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The Wiss M3R is widely considered the industry standard for a reason. These snips handle the vast majority of shim-trimming tasks, from thin stainless steel to standard galvanized flashing, without requiring a specialized tool for every single cut.

The compound action design multiplies hand force, allowing for smooth, clean cuts even when space is tight. Because they feature a serrated blade, the metal stays in place during the cut, preventing the shim from slipping or curling.

For a contractor working on a fast-paced job site, having one tool that performs reliably across multiple gauges is invaluable. They remain the go-to for daily tasks where versatility outweighs extreme specialty performance.

Midwest MWT-6510C Offset Snips: Best for Leverage

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When clearing the handle away from the workpiece is necessary to avoid knuckle scraping, offset snips are the answer. The MWT-6510C model positions the blades above the handles, allowing the snips to pass over the metal sheet without interference.

This design is particularly advantageous when making long, continuous cuts in shim stock or tight areas where the hand would otherwise strike the material. The offset angle allows for a natural wrist position, reducing fatigue during repetitive trimming sessions.

If the project involves high-volume cutting throughout the day, the ergonomic advantage of the offset geometry cannot be overstated. These are a critical asset for maintaining precision when the user is forced to cut at awkward angles.

Malco M2005 Bulldog Snips: For Heavy-Gauge Steel

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Sometimes a project requires shimming with thicker, cold-rolled steel that will snap a standard pair of aviation snips. The Malco M2005 Bulldog is built specifically for this type of brute force, featuring shorter, sturdier blades designed for maximum cutting power.

Because the cutting blades are shorter, the leverage is significantly higher, allowing for effortless work on denser materials. While these are not meant for intricate curves, they are unmatched for straight, heavy-duty trimming.

Use these when the shim thickness moves beyond standard flashing gauges. They provide the confidence that the tool will not buckle under the pressure of thick, high-tensile steel.

Bessey D15A Compound Snips: Top-Tier Precision

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Bessey is known for metallurgy, and the D15A series reflects that with induction-hardened blades that maintain a sharp edge much longer than budget-tier alternatives. These are compact, making them easy to carry in a tool pouch without adding unnecessary bulk.

The small footprint is deceptive, as they deliver impressive cutting power for their size. They excel in tight spots where larger handles would be cumbersome, such as trimming shims under narrow metal roof cleats or tight wall flashing.

Precision is the hallmark of the D15A. If the goal is a perfectly smooth edge that requires no follow-up filing or grinding, these snips are the professional choice.

Knipex 90 55 280 Shears: The Ultimate Power Cutter

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Knipex brings a level of mechanical engineering to sheet metal work that standard snips often lack. These shears utilize a high-leverage pivot point that makes cutting through stainless steel shims feel almost effortless.

Unlike traditional snips, the design focuses on power transfer and durability. They are built for the heavy abuse of a construction site, holding up under daily stress where cheaper hinges might develop play or loosen over time.

They are an investment, but they pay for themselves by reducing physical strain and increasing speed. For those who frequently deal with stainless or high-hardness steel, these are the heavy hitters of the category.

Irwin Vise-Grip Snips: The Best Ergonomic Option

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The Irwin Vise-Grip line focuses heavily on comfort, featuring ProTouch grips that prevent hand slippage and reduce the impact of repeated squeezing. Ergonomics are often ignored, but on a long day of custom fitting, hand fatigue leads to sloppy, inaccurate cuts.

The pivot design on these snips is consistently smooth, allowing for a fluid motion that prevents the “burr” often left behind by cheaper tools. They represent the best balance between price, comfort, and performance for the general contractor.

If the work involves hours of repetitive trimming, the ergonomic design of the Irwin handles will significantly reduce the risk of hand cramps. They are a reliable, comfortable addition to any professional kit.

Straight Left or Right Cut? Choosing Your Snips

Understanding the directional nature of aviation snips is vital for clean cuts. Straight-cut snips are designed for long, linear trimmings and cannot navigate curves without buckling the metal.

Left-cut snips are engineered to cut to the left of the blade, which is ideal for the right-handed user making curved cuts in a counter-clockwise direction. Conversely, right-cut snips are optimized for right-handed users cutting clockwise.

Always match the tool to the path of the cut to ensure the metal remains flat. Using the wrong directional snip forces the material to curl, which ruins the structural integrity of the shim and creates an uneven edge.

Compound vs. Standard Action: Understanding Leverage

Standard action snips operate on a simple pivot, much like a pair of household scissors. While they offer more control for short, delicate snips, they lack the mechanical advantage required for harder steel.

Compound action snips use a linkage system to multiply the force applied by the hand. This is the difference between struggling to finish a cut and sliding through metal with minimal effort.

Always prioritize compound action for construction-grade metal. It reduces the effort required by nearly 50%, which protects the joints and keeps the tool from slipping during a difficult cut.

How to Make Clean Straight Cuts in Steel Shims

Achieving a clean edge starts with how the snips engage the material. Never use the very tip of the blades to start a cut, as the metal will simply bend; instead, use the back half of the blades to get the cleanest bite.

Avoid closing the blades completely at the end of every stroke. Stopping just short of closing allows the blades to keep the metal aligned for the next stroke, preventing the telltale “notches” that occur when the blades exit the material.

If the cut needs to be perfectly straight, mark the line with a scribe rather than a thick marker. A scribe creates a physical groove that acts as a guide for the blades, ensuring the snips stay on track through the entire length of the shim.

Maintaining Your Snips for a Long Productive Life

Snips are precision instruments that require regular care to remain effective. Keep the pivot bolt clean and lubricated with a light machine oil to ensure the handles operate smoothly and don’t bind under load.

Never use aviation snips to cut wire, nails, or hardened steel screws. Doing so creates notches in the cutting edge that will permanently damage the tool’s ability to create a clean, flush edge on shim material.

Finally, keep the blades closed and locked when not in use to prevent the cutting edges from striking other tools in the bag. A dull set of snips is not only frustrating but also dangerous, as it requires more force and increases the likelihood of a slip.

Proper tool selection is the baseline for professional results in any metal-working task. By choosing the right leverage and edge geometry for the specific grade of steel shim, the quality of the finish and the efficiency of the installation will improve immediately.