When you don’t know the exact shim thickness you’ll need, keep various multislotted shim thicknesses on hand so you always have the right one. Streamline the leveling of machines and positioning arms with multiple, evenly spaced mounting fasteners by using a single shim. Slip these shims around existing fasteners without unfastening them, simultaneously leveling each point. They're also known as finger shims.

You can stack multiple shims to achieve your exact thickness, but stacking more than four may cause them to shift. Remember, fewer shims are better, so a couple of thicker shims are more stable than a bunch of thin shims.