Features: Size:Drill diameter: 17mm, round Shafts diameter: 10mm, drilling depth: 17mm, total length: 90mm. Applications: Forstners drill Bit (with tip) can create the fine perforations you need in a variety of wood, wood products, plastic, plywood and other materials. Wide applications: the Forstners bit for industrial hinge installation, maintenance of wood processing, model making. Compatibility: Suitable for drills, vertical frills, hand drills, benches drills. Important: the smaller Forstners drill can be used under a normal hand drill. For the large Forstners drill, it is best to use machine with good mounting performances for drilling work, such as Drills, benches drills or vertical drilling machines, vertical electric drills. Specifications: Materials: Aluminum alloy Size:Drill diameter: 17mm round Shafts diameter: 10mm drilling depth: 17mm total length: 90mm Package Includes: 1PC Forstners Drill Bit note: Please allow 1-3cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.