Features: Achieve precise and efficient woodworking with our square hole mortise chisel drill bit set, designed to effortlessly cut square holes and enhances your productivity. Crafted from high speed steel (hss), these drill bits offer exceptional durability and wear resistance, ensuring long lasting performances in various woodworking projects. Ideal for professional woodworkers seeking high precise tool, as well as DIYer enthusiasts looking for reliable equipment for home crafting tasks. Perfect for furniture making, interior renovation, and intricate craft projects, this set allows you to quickly create clean and accurate holes in wooden materials. These drill bits are for most mortising machines, making them a various addition to any workshop. Specifications: Component:Carbon Steel Package Includes: 4pcs Square Hole Chisel Drill Bits note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.