[Premium Material]:The square hole drill fixed bracket is made of high hardness,steel material,which is wear resistant,sturdy,and not easy to break [Fitment]:The square hole drill bit adapter is fit for bench drill and hand drill clamp with a diameter between 38mm to 55mm/1.5 to 2.2inch [Bench Drill Mortise Accessories]:The square hole drill bit adapter converter is easy to install and remove,you can quickly install or remove it yourself,which is fast and convenient [Note]:Square hole drill bit adapter,products do not include square hole drill and electric drill,double use support bracket for table drill and hand drill [Wide Application]:The square hole drill bit adapter bracket is great for woodworking enthusiasts and professionals,furniture making,and other related industries,ensuring accurate and smooth drilling, Weight: 0.992080179 pounds, Manufacturer: PIXZCSA