Assortments like this are handy to carry with you because it is often not possible to predict which sizes will be required at the job site.

Hanger shims, frame packers or horse-shoe packers are used for vertical packing behind frames, casings, wallboards, etc. They can be clipped or stacked together in any combination of sizes to achieve the desired packing thickness and are designed to be hung over a screw shaft before tightening.

Flexible retainer lugs resist disengagement during fitting.