This is a double-sided hardened die is for the LASSCO WIZER corner cutter model CR-177. One side of the die accepts a 1/8 inch radius blade: the alternate side accepts a 1/2 inch radius blade. For the mating blades, search on CR177-18 or CR177-12 respectively. Or, you may call us for clarification and to place your order. (Old P/N WZ177F)