Product DescriptionThe Dead Air DA001 muzzle device alignment shim kit is designed for barrels threaded 1/2-28, helping you properly time and align a compatible muzzle device during installation. This kit includes three shim thicknesses identified by notch pattern, and the included packaging guide provides thickness and rotation references. For best results, always place the thickest shim(s) on the barrel first.Product Highlights Designed for 1/2-28 threaded barrels for muzzle device timing and alignment Three shim thickness options to fine-tune muzzle device fitment Notch-marked shims for fast thickness identification (one notch, two notches, or no notch) Packaging graphic includes rotation guidance to help achieve proper timing Includes multiple shims to support precise stacking and adjustmentSpecs Brand: Dead Air Manufacturer Part Number: DA001 UPC: 810128160605 Thread compatibility: 1/2-28 Included shim thicknesses: 0.004 in, 0.006 in, 0.060 in Shim identification and quantity (as labeled on packaging): One notch (0.004 in) Qty 4; Two notches (0.006 in) Qty 5; No notch (0.060 in) Qty 1 Package dimensions (supplementary): 4.40 in (L) x 3.00 in (W) x 0.20 in (H)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 products manufacturer.