[Material]:The square hole drill fixed bracket is made of quality steel material,wear resistant,high hardness,sturdy and premium [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 [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,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 premium for woodworking,ensuring accurate and fast drill, Weight: 1.02735414092 pounds, Manufacturer: mophrati