Square hole drill bit adapter fits benchtop drill presses and hand drills with clamp diameter ranging from 38 to 55mm (1.5 to 2.2 inches), allowing for easy installation and use. Enhances the versatility of your table drill and hand drill. Ideal for woodworking, furniture making, and related applications. The mortise converter is easy to install and remove, enabling quick setup and disassembly to save time and effort. The square hole drill fixed bracket is sturdy and durable. Designed for efficient and reliable attachment of drill accessories. Features a precise design for accurate and smooth drilling performance. Note: Square hole drill bit and electric drill are not included. If stored in a humid environment for extended periods, minor rusting may occur. This can be prevented or improved 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 different display settings may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.