Hss Square Hole Saw Blades Drill Bit For Woodworking. FEATURES: Square Hole Drill Can Not Be Used on an Electric Drill, Drill Square Holes Need to Fit a Square Hole Drill Drilling to Use Mortise and Tenon Square Hole Drilled by the Terrible + Outer Sleeve in the Middle of the Combination. Reduce Labor Intensity of Construction Workers, Speed Up the Construction Speed, Reduce Construction Costs for Construction, Installation, Renovation, Decoration Industries. SPECIFICATIONS: DIY Supplies: Woodworking Type: Drill Bit Material: High-speed Steel, Hardness: 56HRClength: As Picture Show Use: Wood Drilling PACKAGE: 1pcs Woodworking Square Hole Drill . We are an international seller, your order will be shipped from abroad so please allow the necessary time of minimum 14 working days for delivery right now depending on where you ship to, due to ongoing delays in postal deliveries globally.