4. This product has requirements for the distance between the drill chuck and the workbench when used (at least 300mm). The diameter of the clamping part of the square hole drill used in this product is also required. 1. Used for a Long Time: This square hole drill bit adapter is made of sturdy High manganese steel, excellent treatment, which makes it and not easy to rust. You can use it for a long time without worrying about wear and tear. 3. Skid-Mounted Design: With the skid-mounted design, you can easily attach or detach the adapter to your drill bit, saving you time and effort without complicated tools or steps. 2. Square Hole Drill Bit Design: With this practical square hole drill bit adapter, you can drill square holes quickly and precisely. It is designed to improve work efficiency and quality, and it is compatible with most drill models. 5. Widely Used: This square hole drill bit adapter is not only suitable for woodworking and furniture making but also for other related industries. It is convenient to use., Weight: 3.22315827044 pounds, Manufacturer: Wesafrae