Product Description The Yankee Hill Machine Barrel Shim Set to be used to correctly orient a timed muzzle device. 1/2"-28 kit includes:2x 0.002"3x 0.005"1x 0.020" 5/8"-24 kit includes:2x 0.002"5x 0.005"1x 0.020" Yankee Hill Machine Barrel Shim Kit 7.62mm 5/8"-24 at MidwayUSA $9.50 Buy Now Check Price on Amazon Check Price on eBay Category: Gun Parts & AccessoriesColor: GreysSize: 7.62mm 5/8"