5/8-24 Barrel Shim Kit is for 5.56mm/ .223 These shims assist in timing and alignment, dependable design constructed and precision made from quality 304 stainless steel. Our shims Will Not adding unnecessary bulk of your barrel.

Outer Diameter of .77" & Inner Diameter of .51"

For Timing and Alignment. Fit Barrels with 1/2"-28 TPI (.223/5.56) Threads

it includes .002"x 4, .003"x 4, .004"x 4, .008"x 4, .010"x 4, .012"x 4, .016"x4, .020"x 4, .024"x 4, .028"x 4 and .030"x 4 shims. Total 44 Pieces

44 Pack Stainless steel shims of various thickness by Clearly Marked & Separate Packaged,so you can quickly identify thicknesses and save time.