[Premium Material] Square hole drilling fixing brackets are made of all-steel castings, which are strong and durable. It adopts a versatile, efficient way to quickly attach or remove a drill attachment. Note: If stored in a humid environment for a long time, it may cause some surface rust, which can be improved by simply wiping some protective oil. [Bench Drill Hand Drill Dual Purpose] 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 making, and other related industries. [Mortising Attachment for Drill Press] Square hole drill bit adapter is fit for benchtop drill presses and hand drill clamp diameter ranging between 38 to 55mm/1.5 to 2.2inch, allowing for effortless installation and use. Your ultimate solution for enhancing the versatility of your table drill and hand drill. [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. [Effective and Precise] The adapter ensures accurate and smooth drilling operation. The precision design of this mortising attachment for drill press ensures that you will be able to drill the proper mortise and tenon holes in the fastest way possible.More convenient and faster than mortise machine. Note: The product does not include square hole drills and electric drills. This square hole drill bit adapter adopts all-steel castings, which is sturdy and durable. It adopts precise design and easy to install and remove. This tool is suitable for clamping diameter ranges from 38 to 55MM/1.5 to 2.2 inches. Quick Installation - This square hole drill fixing bracket is high efficient to install and remove. It can ensure accurate and smooth drilling operations. Multifunctional - Our square hole drill bit adapter is multifunctional and suitable for woodworking, furniture making and ot