Hyjoy 6-Piece Square Hole Drill Bit Set (5 Drill Bits + Adapter, 6.4 / 8 / 9.5 / 10 / 12.7 mm, Square Shank, Sandwichl)

Square Hole Drill Bit Set: Includes 1 square hole drill bit adapter and 5 square hole drill bits, drill diameters: 1/4 inch (6.4mm), 5/16 inch (8mm), 3/8 inch (9.5mm), 2/5 inch (10mm), 1/2 inch (12.7mm) and hand drill diameters from 38 to 55mm/1.5 to 2.2 inches for installation and usage. Materials: The square hole drill bit adapter is constructed from carbon steel and can securely hold the wood, minimizing usage errors. The square hole mortise chisel drill set is made of hardened steel. After processing, the achieves hardness, robustness, and longevity, with the square chisel being and resistant to wear. The sturdy round handle assists in stability during . Efficient and Convenient: The bit adapter and the matching drill attachments in 5 sizes make it easier to use, and the design of the drill press mortise attachment ensures that you can drill the mortise and mortise holes in the fastest manner; More convenient and quicker than mortise machine. Usage: for creating square holes in wood using mortising machine or attachment. These woodworking mortising chisel bits worker effort, accelerate the process, and lower expenses for , setup, remodeling, and decoration . Note: This adapter is not suitable for lithium battery drills and drills lacking round bore bearings. Suitable for old table drills and household table drills, check before use.