1/4 Compression Router Bit 1/4 Shank,1 Inch CL. 2-1/2 Inch OVL, Carbide Up&Down CNC Router Bits for Wood Carving, Engraving and Slot Mortise 1/4"DIA - 1/4"SHK - 1'' CL - 2-1/2'' OVL 1