Set 4 Pezzi Alesatore Manuale Regolabile da H12 a H15 Capacità 1.1/16" 1.13/1" USA
Size : H12 TO H15. 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.