Brass Plated Stamped Steel SPLIT RIVET CAPS that are 3/8"in diameter. These end caps are a method of securing our split split rivets. The end caps are sold in bags of 50. Directions for using Split Rivet Caps 1. Tap the Split Rivet through the wood and/or tin, etc., exposing the pronged ends. 2. Place a piece of wood or metal against the head of the rivet. 3. Place the rivet cap over the exposed rivet prongs and gently hammer. The rivet prongs will curl in the rivet cap.