Remember when it was hip to be square Make mortising easy with the WEN Mortising Chisel Set. Quickly and easily drill clean, square holes, slots and mortises for a perfect fit with your tenon. Featuring premium heat-treated steel, each bit is precision-ground to leave clean walls and a smooth floor in your workpiece, as well as to minimize heat buildup. Our design features a large window in the shank for effective chip ejection, improved visibility and fast operation. With a 1/4 in., 5/16 in., 3/8 in. and 1/2 in. chisel included, this set is compatible with the WEN 43012 and 43013 5-Amp Cast Iron Bench Mortisers, as well as any mortising machine or drill press mortising attachment on the market with a 3/4 in. chisel bushing. Remember when making furniture was fast and easy Remember WEN.