General description Set of 6 Square Hole Drill Bits, Steel Hollow Chisel Carpenter Tool Set designed for professional use in construction, installation, renovation, and decoration industries. This set includes various slot diameters to meet diverse woodworking needs. Technical specifications Material: Special steel with heat treatment Hardness: HRC 48-50 Slot diameters: 1/4 inch (6.4 mm), 5/16 inch (8 mm), 3/8 inch (9.5 mm), 1/2 inch (12.7 mm), 9/16 inch (14 mm), 5/8 inch (16 mm) Weight per bit: 1/4 inch - 106 g, 5/16 inch - 131 g, 3/8 inch - 154 g, 1/2 inch - 195 g, 9/16 inch - 214 g, 5/8 inch - 222 g Total weight: approximately 1215 g Usage Ideal for mortising, chiseling, and woodworking tasks Compatible with electric drills, hammers, and other tools for punching square holes Can be used with plug-in and tenon machines for double action