Fitment: The bench drill Location fits diameters of 65mm, which is convenient for matching with different bench drills and hand drill clamp. Please check before ordering. Dual Use Support Bracket: Bench drill Location set suitable for table drill and hand drill, which is perfect for woodworking applications, tenon, drill, mortising and more. Bench Drill Mortise Accessories: Mortise converter hole drilling is easy to install and remove, you can quickly install or remove yourself. Wide Application: Square tenon converter mainly used for woodworking, round, square and special square, round recesses, internal grinding, metal drilling,etc. Material: Square hole drill fixed bracket is made of all steel casting, sturdy and strong. Note: Products do not include square hole drill and electric drill. Specification: Material: Steel Size Chart: Hole: 6.5cm/2.56inch Hole: 1.9cm/0.75inch Height: 18cm/7.09inch Package Includes: 1 Square Hole Drill Fixed Bracket Note: Please allow slightly errors due to manual measurement and different monitors.