Introducing the plastic composite flat shims by Glazelock! Industry standard alignment and leveling of doors, windows, stairs, cabinets, counters, sheetrock, drywall, furniture, machinery, plumbing for DIY'rs and professionals alike! Made of High Impact Polystyrene plastic, these shim spacers can also be used as tile spacers and won't rot, shrink or swell. The flat design allows the shim to fit in tight spaces, making install more streamlined. Glazelock's high density plastic shim quality and durability are trusted by professionals across several industries. Check out our larger 1,000-piece quantity options! Width options include: 1/4-inch (black), 1/8-inch (red), and 1/16-inch (blue). These high impact polystyrene (HIPS) frame shims are made in Kankakee, IL, USA!