The Yankee Hill Barrel Shim Set features a 1/2'' inner diameter and is crafted from durable steel ensuring reliable performance and long-lasting use. Its sleek silver color adds a professional touch to your firearm assembly providing a precise fit and optimal alignment for muzzle devices. Ideal for gunsmiths and firearm enthusiasts this shim set is essential for achieving the perfect tension and orientation during installation enhancing both functionality and aesthetics of your equipment.