Replacement go kart brake pucks used on most all  Heavy-Duty go kart Disc Brake Calipers . 1-5/8" dia. 3/8" thick (set of two) Replaces comet 218198, Murray 776938 go kart brake pads. Also used on mini bike calibers.
Thomas MFG, Knott, Carlisle, Manco, ASW, Comet, Yerfdog, Bristers, ThunderKart, Carter, and many more..Just about all of the old school karts used these.