Drill Square Hole Chisel Bit Mortising Woodworking PRODUCT DETAILS HG0012888 Specification: Brand new Name: Square Hole Saw Material: High-speed steel Color: as picture shows 2 sizes for choosing: 10mm/16mm Length: 203mm(10mm diameter); 208mm(16mm diameter) Square hole drill can not be used on an electric drill, drill square holes need to fit a square hole drill drilling (mortise and tenon machine) 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. Arc design, exquisite sharpen durable. Use matters: Square hole drill is mainly used for woodworking aspects. Package included: 1 x Square Hole Drill Note: Please allow 1-2cm errors due to manual measurement Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same llet