1. Used for a Long Time: This square hole drill bit adapter is made of sturdy High manganese steel, excellent surface treatment, which makes it durable and not easy to rust. You can use it for a long time without worrying about wear and tear. 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. 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. 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. 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. Applicable drilling machines:60mm, 58mm, 55mm and 52.5mm Applicable drill bits:1/4 inch, 5/8 inch, 3/8 inch and 1/2 inch Handle type:round handle Groove Type:Straight Maximum height of applicable boards:10cm Maximum width of applicable board:6.5cm Positioning fixed aperture:19mm Notice: 1. This product is used with a bench drill (not included), and there are size requirements for the bench drill used. 2. The tenon chisel is too sharp, please pay attention to safety when taking it out. 3. Please use the correct combination of drill bit and chisel. Both tools must be sharp, if one is blunt, excessive friction will occur, which will generate heat and damage the pivot. Colour:Black Material:High manganese steel Size:inner diameter of connection hole 65mm, total height 180mm, fixed square drill bit hole 19mm Package Contents: 1 * bra