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 to save time and effort. The square hole drill fixed bracket is constructed to be durable and stable. This adapter offers a reliable and efficient way to attach and detach drill accessories. Featuring a precise design, 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 accessories are not part of the package. Note: Due to lighting reflections and differences in display screens, the color shown in images may vary slightly from the actual product. Measurement tolerances may vary by +/- 1-3 cm.