Specifications: Material: high-speed steel. Color: Silver. Sizes: 6mm, 6.4mm, 8mm, 9.5mm, 10mm, 12.5mm,12.7mm, 14mm, 15mm, 16mm, 18mm, 19mm, 20mm, 22mm, 25mm,30mm. Features: 1. Square hole drill need to fit a square hole drill drilling (mortise and tenon machine) to use. 2. This Mortising Chisel is great for drilling square holes in wood with a mortising machine or a mortising attachment. 3. Square hole drill is mainly used for woodworking aspects. Suitable for wood, particle board and other openings. 4. Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries. 5. The spiral design facilitates the discharge of wood chips and more convenient to drill. 6.The dimension refers to the length of the square hole drilled by the square hole. 7.The cylinder diameter of the clamped portion is 19mm/0.74inch. Note: 1. Please allow 1-2cm errors due to manual measurement. 2. Due to the different display and different light, the picture may not reflect the actual color of the item. 3. If you manually open the square hole, you need a hand drill and a hammer and other tools. First, mark the position of the hole and use the hole drill to make a hole. Secondly, after removing the core, use a square hole jacket to align the position of the hole. Finally, tap the square hole continuously and slowly.Then,you can get the square hole. Package Included: 1 x Tenon Hole Drill Bit.
