[Dual Purpose Manual Bench Drill] The square hole drill bit adapter is compatible with both bench drills 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. [Premium Material] The square hole punching fixing brackets are made of all-steel castings, which are sturdy and durable. It adopts a versatile and efficient way to quickly place or remove a drill attachment. Note: If stored in a wet for time, it may cause oxidation on the surface, which can be improved by simply rubbing a little protective oil. [Easy to Install and Remove] This square hole drill bit adapter is easy to install and remove. You can quickly install or remove it yourself, saving time and energy. [Drill Mortise Attachment] The square hole drill bit adapter is suitable for table drills and hand drill clamp diameters ranging from 38 to 55mm/1.5 to 2.2 inches, allowing for effortless installation and use. Your ultimate solution to improve the versatility of your table drill and hand drill. [Effective and Accurate] The adapter ensures precise and smooth drilling operation. The precision design of this drill mortise attachment ensures that you will be able to drill the appropriate mortise holes as quickly as possible. More convenient and faster than mortise machine. Note: The product does not include square drills and electric drills., Manufacturer: Bumdenuu