Features:Newly designed woodworking drill bit with positioning function, the drilling depth can be adjusted from 10 to 50mm, including five common opening diameters 15/20/25/30/35mm.The holes are neat, flat and without broken edges, and no vibration occurs.The cutting resistance is small, the drilling speed is increased, and the chips are easily taken out.It can be used for opening holes in various wood, wood products, plastics, plywood and other materials.The product is easy to install and use. Just install it in a normal hand drill.Specification:Material: CarbideHole depth adjustment: 10~50mmTotal length of drill bit: 78mmShank length: 27mmShank diameter: 7, 8mmOpening diameter: 15mm, 20mm, 25mm, 30mm, 35mmPackage weight: Approx. 500gPackage list:5 * Drill Bit2 * Hex Wrench.