Swhacker HDX3 Multi-Sharpener Dual Angle Sharpening System Utilizes tungsten carbide bits that are 91.3 HRC hardness Carbide bits are mirror polished with diamond honed cutting edges Made from solid 6061 aircraft aluminum, using all aluminum rivets Requires no oiling or cleaning Features two broadhead tip tighteners Utilizes tungsten carbide bits that are 91.3 HRC hardness Carbide bits are mirror polished with diamond honed cutting edges Made from solid 6061 aircraft aluminum, using all aluminum rivets Requires no oiling or cleaning Features two broadhead tip tighteners