Easy to Use: Professional woodworking tool, the square hole drill bit adapter bracket helps accurate and smooth drilling. Fitment: The square hole drill bit adapter is suitable for hand electric drills, but NOT suitable for bench drills and rechargeable hand drills. 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. Note: The square hole drill bit fixing bracket supports the exposed clamping part of the electric hand drill with a width of about 20mm/0.79inch and a diameter of 38mm-43mm/1.50inch-1.69inch. Please confirm the size carefully., Weight: 0.57099725858 Pounds, Manufacturer: Teuypty