General description These 6 Pcs Square Hole Drill Bits Set are made of special steel with heat treatment, achieving high hardness of HRC 48-50. Designed for woodworking, these tools are ideal for creating square holes and are compatible with mortise and tenon machines. The set includes various diameters to meet different 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 piece: 1/4 inch - 106g, 5/16 inch - 131g, 3/8 inch - 154g, 1/2 inch - 195g, 9/16 inch - 214g, 5/8 inch - 222g Total weight: approximately 1215g Compatibility and accessories Compatible with mortise and tenon machines Requires electric drill and hammer for use Usage Ideal for mortising, chiseling, and woodworking tasks Suitable for construction, installation, renovation, and decoration industries