Hoopzi - 4 Piece Chisel Set Square Hole Drill Bits, Steel Hollow Chisel Woodworking Tools Set (1/4 -1/2 - 5/16 - 3/8 Inch)

General description Professional design ideal for drilling square holes in wood with a mortiser. The square hole drill bit is mainly used in the woodworking field, making it perfect for construction, renovation, and decoration sectors. Technical specifications Material: High speed steel Heat treatment hardness: HRC48~50 Sizes: 1/4' (6.35mm), 5/16' (7.94mm), 3/8' (9.5mm), 1/2' (12.7mm) Compatibility and accessories Fits all machines and drill attachments Usage Reduces the labor intensity of construction workers Accelerates the speed of work and reduces costs The punch square needs to use a drill, hammer, or other tools (none of these items are included)