Product DescriptionEnsure precise alignment of your timed muzzle device with the Yankee Hill Machine Barrel Shim Set. Designed for use with YHM 5.56 mm Quick-Detach muzzle brakes, this shim kit features a 1/2 inch inside diameter and includes a selection of shim thicknesses to achieve accurate timing during installation.Product Highlights Purpose-built for timing YHM 5.56 mm Quick-Detach muzzle brakes 1/2 inch inside diameter fits standard 1/2 inch muzzle threads Assorted shim thicknesses for fine, repeatable alignment Streamlines installation for proper orientation of timed devices Durable shims optimized for gunsmithing and build projects Specs Product Type: Barrel Shim Set Inner Diameter: 1/2 inch Shim Thicknesses Included: 2 x; 0.002 in, 3 x; 0.005 in, 1 x; 0.020 in Compatibility: YHM 5.56 mm Quick-Detach muzzle brakes; timing of muzzle devices UPC: 816701017663 Manufacturer Part Number: SHIM-3102-SET Brand Name: Yankee Hill Machine Co Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.