Product Description Product Description: Durable Material: The square hole drill bit holder is made of high-quality stainless steel, which is wear-resistant, high-hardness, sturdy, and durable. Applications: The square hole drill bit adapter is suitable for bench drills and hand drills with diameters between 38mm and 55mm/1.5 to 2.2 inches. Bench Drill Tenon Fittings: The woodworking drill guide is easy to install and remove; you can quickly install or remove it yourself for convenience. Note: This product is a square hole drill bit adapter and does not include square hole drill bits or an electric drill. This is a dual-purpose support for bench drills and hand drills. Wide Applications: The drill chuck holder is ideal for woodworking, ensuring precise and smooth drilling. Specifications: Product Dimensions: 10cm x 1.9cm x 5.5cm / 3.94 inches x 0.75 inches x 2.17 inches Material: Stainless Steel Package List: Optional Items: Style A: 1 square hole drill bit adapter or Style B: 1 square hole drill bit adapter + 4 screws or Style C: 1 square hole drill bit adapter + 4 screws + 1 nut Note: Please allow slight errors due to manual measurement and different monitors.