Carbide tips are designed to cut holes cleanly and easily remove debris. ;A depth stopper can be installed on the shaft to prevent you from drilling too deep, then you can control the depth of the hole from 10mm to 40mm. In addition, you can remove the cork with unlimited depth. ; Works with all kinds of wood, plywood, veneer, great for drilling concealed hinges and door locks. Circular rim guide, all arc holes of one turn, all directions, ideal for drilling flat bottom holes, pocket holes or overlapping holes. ; Suitable for drills, pistol drills, bench drills, vertical drills, hand-held electric drills, electromechanical drills, mobile belt drills, etc. Note: The data are all manual measurement, please allow error of 1 - 3cm, due to the light and display difference, there will be a certain color difference, depending on the physical object received Delivery Quantity: (according to the main picture)