Description: Durable Material: Fixed holder bracket for square hole drill is made of high quality stainless steel material, wear resistant, high hardness, sturdy and durable. Fitment: The square hole drill bit adapterconverter is fit for table drill and hand drill clamp with a diameter between 38mm to 55mm/1.5 to 2.2inch Bench Drill Mortise Accessories: Woodworking drill guide is easy to install and remove, you can quickly install or remove it yourself, fast and convenient. Note: Square hole drill bit adapter, products do not include square hole drill and electric drill, dual use support bracket for table drill and hand drill. Wide Application: Drill jigbracket is perfect for woodworking, ensuring accurate and smooth drilling. Specification: Product size: 10cmx1.9cmx5.5cm/3.94inchx0.75inchx2.17inch Material: Stainless Steel Package Includes: Optional: 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 slightly errors due to manual measurement and different monitors.