Precision boring bit with the ability to add a chamfer, recess or cut straight through, makes this a unique type of Forstner bit. Fully adjustable with a durable tungsten tip, the cutter has an outer scribe for a very clean precise hole. There are two adjustable wings that are used depending on the hole size. Size range 22 - 54mm. 12.7mm shank. Overall length is 100mm, working length 70mm.