Square Hole Drill Bits Mortising Woodworking Saw Mortise Chisel Drill Bit Kit

Square Hole Drill Bits Mortising Woodworking Saw Mortise Chisel Drill Bit Kit Description: 100% Brand New And High Quality. The whole heat treatment HRC48-50 high hardness. The core is lengthened and the concentricity is high. With the use of the square machine if you manually open the square hole you need a hand drill and a hammer and other tools Product specifications: 1/4 (6.35mm) 5/16 (7.94mm) 3/8 (9.5mm) 1/2 (12.7mm). This dimension refers to the side length of the square hole punched by the square hole drill. The cylindrical portion of the clamping portion has a diameter of 19 mm. The square hole drill cores are all above 210mm and belong to the elongated core. 1/4 (6.35mm) - 135g 5/16 (7.94mm) - 140g 3/8 (9.5mm) - 160g 1/2 (12.7mm) - 215 grams Package Included: 4 x Woodworking Saw Mortise Chisel Drill Bit Kit