Sumnacon Watch Press Set with 12 Dies with Metal Inserts (13-Piece) New Watch Press Set Back Case Closer Crystal Glass Fitting Watch Repair Tool Cast Iron press;It is made of cast metal to ensure strength; It comes with an assortment of 12 dies, double-sided dies: 18 & 20, 21 & 23, 24 & 26, 28 & 30, 31 & 32, 33 & 34, 36 & 38, 40 & 42, 44 & 46, 48 & 50, flat 25mm and cut-out 45mm These exclusive straight wall nylon dies will not scratch or mar crystals; Great for snap on watches. Snap-on system allows dies to snap on and off quickly;