Square Hole Drill Bit - 4Pcs Woodworking Mortising Chisel Countersink Set, Wood Hole Saw Mortiser Cutter DIY Carpenter Power Tool Kits for Drill Press 1/4" 5/16" 3/8" 1/2" - JONMON, SQUAREHOLE-4P

• DRILL SLEEVE DESIGN - Mortise and tenon square hole drill design with drill sleeve make the force in a plane. The effective protection can avoid the burst at the beginning of use. PRODUCT FEATURE - The square hole drill is forged with bearing steel and through integral heat treatment. Design with long U-shaped flute for easy to discharge wood chip and improve drilling efficiency. ROUND SHANK - The wood mortise drill bits adopt round shank design to make the clamping more stable.Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects. PRODUCT SIZE - Slot diameter: 1/4"(6.4mm), 5/16"(8mm), 3/8"(9.5mm), 1/2"(12.7mm). Working length: 45mm, 60mm, 60mm, 60mm. Including 6 different sizes to meet your need. WIDE APPLICATION - Square hole drill is mainly used for woodworking aspects. Great for drilling square holes in density board, MDF, particleboard, etc. Suitable for construction, installation, renovation, decoration industry and so on.