[Premium Material] The square hole drill bit adapters are made of all-steel castings, strong and durable. It adopts a versatile and effective way to quickly attach or remove a drill accessory. Note: If stored for a long time in a humid environment, it may cause some rust, which can be improved by simply wiping some protective film. [Dual-Purpose Hand Drill] The square hole drill bit adapter is compatible with both drill presses and hand drills, making it a versatile tool for a wide range of applications. It is particularly effective for woodworking, furniture manufacturing and other related industries. [Mortise Drill Press Attachment] The square hole drill bit adapter is suitable for table drill presses and hand drill clamps with a diameter between 38 and 55 mm/1.5 and 2.2 inches, allowing for effortless installation and use. Your ultimate solution to improve the versatility of your table drill and hand drill. [Easy to Install and Remove] This square hole drill bit adapter is easy to