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Shims, or Spacers, are thin strips of metal or plastic used to fill gaps between objects to componsate for leveling issues. Shims can be used alone or stacked, depending on the application. Slotted shims, shaped somewhat like a horseshoe, are used to slide around an obstacle such as a screw, nail or a mount. Rolled and Flat Shims, on the other hand, are for general applications and can be cut to size to fit a particular space. Shims are available in various sizes and gauges and are made from stainless steel, brass, hard steel or plastic.