ARP 200-8554 10-Pack Of Special Purpose Washers, 3/8" Inside Diameter, 5/8" Outside Diameter, .120" Thick Parallel-ground and hardened high performance washers Constructed from premium chrome moly and finished in black oxide Traditional style washer with no inside diameter chamfer 3/8" inside diameter, 5/8" outside diameter, and .120" thick Each package contains 10 washers