[Durable Material]: Fixed holder bracket for square hole drill is made of high quality material, wear resistant, high hardness, sturdy and durable. [Fitment]: The square hole drill bit adapter converter Clamping range 38-45mm, inner hole 11cm [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 jig bracket is perfect for woodworking, ensuring accurate and smooth drilling. Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Material: Metal colour: green Package Contents: 1 x Square Hole Drill Bit Adapter Only 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.