6PCS Woodworking Square Hole Mortise Drill Bits

Sharp square hole drill bits made of bearing steel, hardness 56HRC, lengthened core, sharp cutting edge, continuous blade, quick, and high efficiency – Set includes: 1 x 1/2-Inch(12.7mm) 1 x 1/4-Inch(6.4mm) 1 x 3/8-Inch(9.5mm) 1 x 5/8-Inch(16mm) 1 x 5/16-Inch(8mm) 1 x 9/16-Inch(14mm)