Square hole drill bit adapter is compatible with benchtop drill presses and hand drills with clamp diameters ranging from 38 to 55mm (1.5 to 2.2 inches), allowing for easy installation and use. This adapter enhances the versatility of your table drill and hand drill. Ideal for woodworking, furniture making, and related applications, the square hole drill bit adapter functions as a mortise converter for efficient drilling. It is designed for quick and simple installation and removal, saving time and effort during use. The square hole drill fixed bracket is constructed from sturdy stainless steel, ensuring durability and reliable performance. With its precise engineering, the adapter delivers accurate and smooth drilling operations. Note: The square hole drill bit and electric drill are not included. If stored in a humid environment for extended periods, minor surface rust may occur. This can be prevented or resolved by applying a light coat of protective oil. Material: Stainless steel Color: Silver Package Contents: 1 x Square Hole Drill Bit Adapter Note: Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement may vary by +/- 1-3 cm.