4Pcs 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 industries. This set reduces the labor intensity of construction workers while speeding up work and reducing costs. 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 Package includes: 1 piece of each size (1/4", 5/16", 3/8", 1/2") Note: The punch square requires a drill, hammer, or other tools (none included)