General description Made of high-speed steel, this HSS twist drill bit set is designed for woodworking, featuring a square auger and mortising chisel for creating square holes. The durable construction ensures long-lasting use, making it an essential tool for any woodworking project. Technical specifications Material: High-speed steel Sizes available: 6.4mm, 8mm, 9.5mm, 12.7mm Compatibility and accessories Package includes: 1x square auger Installation The square drill cannot be used directly with an electric drill; it must be connected to the mortise to extend the service life of the drill. Usage The square auger is suitable for various positions, making woodworking more convenient and easier.