Bi-metal holes saws with a TUFF TOOTH™ design is reinforced to cut stronger and last longer- Patented VARI-TOOTH® design resists tooth strippage- High speed steel teeth resist breaking and offer extended life- Thick backing plate with holes for drive pins resists damage due to high torque.Box of 10 Lenox V218HE Hacksaw Blades 300mm (12in) x 18tpi