Tandy Leather Factory-Craftool Dot/Rivet Anvil. One side is flat and one side is concave. It is the base for setting Line 20 & 24 Snaps, and any convex headed rivet back concho. This package contains one dot/rivet anvil. Recommended for ages 8 and up. WARNING: Choking Hazard-small parts. Not recommended for ages 3 and up. Imported.