Nuovo set attrezzi alesatore manuale regolabile H15 da 1,1/2" a 1,13/16" da 38,10 a 46,03 mm USA
They are generally referenced by a latter which equates to a size range. The Disposable blade slide along a tapered groove. The act of tightening and loosening the restraining nuts at each end varies the size that may be cut.