Made of premium high-speed steel: These square hole drill bits are made of premium high-speed steel (HSS), offering excellent hardness, wear resistance, and lifespan. Ideal for efficient woodworking projects.Square Hole Mortising Design: Designed for clean, precise square holes in wood. Perfect for creating mortises for tenons, locks, hinges, and other joinery, enhancing the strength and aesthetics of furniture.Auger Drill and Chisel Combination: The inner anuger and outer square chisel work together to drill and chisel in one step, significantly improving efficiency compared to traditional methods.Ideal for DIY Furniture and Woodworking: Designed for DIY enthusiasts and professional woodworkers, suitable for making tables, cabinets, doors, frames, and other wooden furniture. Helps you achieve precise mortise and tenon joints for professional-grade results.Compatible with Bench Drills: Compatible with most bench drills and mortising machines that support square hole chisels. Please check shank diameter and machine compatibility before purchasing.Color: As ShownMaterial: High Speed SteelPackage Contents:4 * drill bitsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.