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 for drilling work, such as Drills, benches drills or vertical drilling machines, vertical electric drills 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,, 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, Manufacturer: Beimus