Rustproof aluminum heads with steel shanks. Use with hand or air riveters. Blind rivet with dome head. Hardened. Popular sizes blind rivets fit most hand or air riveters, foreign or domestic. Comes in a convenient plastic sectioned storage case. Note: Storage case may vary due to multiple manufacturers. Sizes: 250 Pc - 1/8" x 1/4" 250 Pc - 1/8" x 5/16" 250 Pc - 1/8" x 3/8" 250 Pc - 1/8" x 5/8"