HSS Twist Drill Bits For Woodworking, Mortising Drill Set, Square Auger, Mortising Chisel, Square Hole, Woodworking Drill, Tool Kit, Description: Made of high speed steel, this kind of square hole auger could be used for a long time because it is not easy to be broken or damaged. The square hole drill is resistant to corrosion. abrasion that you can use for a long time, not easy to be damaged. Square auger is suitable for different positions, enough to meet your needs, making your woodworking more convenient and easier. The square drill cant be used on the electric drill directly, you need to contact it on the mortise, extend the service time of the drill. There are several sizes designed for you to choose, you can order as you need. Specification: Material: high speed steel. Color: show as picture es. Size: 6.4mm, 8mm, 9.5mm, 12.7mm Package Included: 1x Square Auger.