Description: 【Fitment】: The square hole drill bit adapter is fit for table drill and hand drill clamp with a diameter between 38mm to 55mm/1.5 to 2.2inch. 【Easy to install】: The square hole drill bit adapter converter is easy to install and remove, you can quickly install or remove it yourself, fast and convenient. 【Note】: Drill Bit Fixing Bracket, products do not include square hole drill and electric drill, dual use support bracket for table drill and hand drill. 【Wide Application】: The Drill Machine Accessory is perfect for table drill, Drill Machine, Mortising Machine, hand drill. Square Hole Drill Bit Adapter is perfect for woodworking, furniture making, and other related industries. 【Durable Material】: The square hole drill fixed bracket is made of high quality stainless steel material, wear resistant, high hardness, 3.94''x0.75''x2.17'' in size. Specification: Material: Stainless Steel Size Chart: 10cmx1.9cmx5.5cm/3.94inchx0.75inchx2.17inch Package Includes: Optional: 1 Square Hole Drill Bit Adapter 2 black gloves or 1 Square Hole Drill Bit Adapter 4 Screws 2 black gloves or 1 Square Hole Drill Bit Adapter 1 complete set of accessory 2 black gloves Note: Please allow slightly errors due to manual measurement and different monitors.