Description: 【Material】: The Square Hole Drill Bit Adapter is made of Stainless Steel material, ensuring its robustness and durability for long term use. 【Versatile Accessories】: This Mortising Attachment for Drill Press is suitable for both bench drills and hand drills, accommodating clamp diameters between 38 to 55MM/1.5 to 2.2 inches. 【Dual Use Bracket】: The Square Hole Drill Fixing Bracket is designed for both bench drills and hand drills, offering versatility in your woodwork projects. 【Easy Installation】: The Drill Machine Accessory features a convenient installation and removal converter, allowing you to quickly install or remove it yourself. 【Wide Application】: The Mortise Machine is suitable for home drill presses, furniture making, woodwork, etc. Specification: Length: 15.5cm/6.10inch Inner Length: 11cm/4.33inch Clamp Hole: 1.9cm/0.75inch Clamp Diameter: between 38MM to 55MM/between 1.50inch to 2.17inch Package Includes: 1 Square Hole Drill Bit Adapter Note: Please allow slightly errors 1-2cm differences due to manual measurement.