[ Material]: The square hole drill fixed bracket is made of high quality cast aluminum material, wear , high hardness, sturdy and .[Fitment]: The square hole drill bit adapter is suitable for hand electric drills, but NOT suitable for bench drills and rechargeable hand drills.[Note]: The square hole drill bit fixing bracket supports the exposed clamping part of the electric hand drill a diameter of 38mm-43mm/1.50inch-1.69inch. Please confirm the size carefully.[Easy to Use]: Professional woodworking tool, the square hole drill bit adapter bracket helps accurate and smooth drilling.[Easy Installation]: The square hole drill bit adapter mortise tool is easy to install and remove, you can quickly install or remove it yourself, fast and convenient.Please note:The physical slightly color difference or difference, does not affect the use, please do not mind, thank you!Colour:As ShownMaterial:aluminumPackage Contents:1 * Square Hole Drill Bit AdapterOnly 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.