Excelvan Professional 13 Piece Watch Case Press Watch Back Press Tool Set Closer Crystal Glass Fitting Repair Tool with 12 Nylon Dies Brand: Excelvan (1 year warranty and friendly customer service) Snap-on system allows dies to snap on and off quickly These exclusive straight wall nylon dies will not scratch or mar crystals Face down configuration means the repair person sees the case back being closed It comes with an assortment of 12 dies to allow for 24,26,28,30,31,32,33,34,36,38,40,42