Product Description: Quantity: one piece Note: The products do not include square drill and electric drill. Material: fixed stand for square hole drill made of cast iron, sturdy. Compatibility: for table drill and hand drill Clamping diameter between 38-55 mm / 1.5-2.2 inch< /p> Mortise accessories for bench drill: The mortise converter is easy to install and remove, you can quickly install or remove it yourself. Holder bracket Dual Purpose: For Bench Drill and Hand Drill Notice: 1. Lithium battery speed control series electric drills are not suitable for use with this stand 2. Bench drills without round diameter bearings are not suitable for use with this stand 3. Suitable for old bench drills and domestic bench drills. Since the distance between the chuck and the base of the old bench drill and the household bench drill is relatively short, the bracket design is relatively short. Requirements: The maximum diameter of the rolling circle flange is 55 mm. The height of the chuck is 10 cm 4. Suitable for ordinary hand-held electric drills, suitable for old and household small bench drills