Features Positioning Function: 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. Without Broken Edges: The holes are neat, flat and without broken edges, and no vibration occurs. Reliable Performance: The forstner drill bit cutting resistance is small, the drilling speed is increased, and the chips are easily taken out. Scope of Application: The forstner drill bit can be used for opening holes in various wood, wood products, plastics, plywood and other materials. Easy to Install: The drill bit is easy to install and use. Just install it in a normal hand drill. Specification: Material: Carbide Hole depth adjustment: 10~50mm Total length of drill bit: 78mm Shank length: 27mm Shank diameter: 7, 8mm Opening diameter: 15mm, 20mm, 25mm, 30mm, 35mm Package weight: Approx. 500g   Package list: 5 * Drill Bit 2 * Hex Wrench Package List