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. It is an ideal solution for enhancing the versatility of your table drill and hand drill. This square hole drill bit adapter is suitable for woodworking, furniture making, and related applications. The mortise converter is simple to install and remove, enabling quick setup and disassembly, saving time and effort. The square hole drill fixed bracket is constructed to be sturdy and durable. For a versatile and efficient way to attach or remove drill accessories, the square hole drill bit adapter is a reliable choice. Designed for precision, the adapter ensures accurate and consistent drilling performance. 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 improved by applying a light coat of protective oil. Material: Stainless steel Color: Silver Package Contents: 1 x Square Hole Drill Bit Adapter Only the items listed above are included; other products are not part of the package. Note: Lighting effects and monitor settings may cause slight variations in color appearance between the image and the actual item. Measurement tolerance: +/- 1-3 cm.