AS-9 series stones are made of aluminum oxide and were originally intended for the treatment of metal after electric spark machining (EDM)

The linear ball-bearing provides extra smooth shaft movement and requires no lubrication or cleaning

Ruby Ceramic stones should be used with oil as a lubricant (oleic acid

The stone travel range will be limited to approximately 4"

Shapton Pro series stones are universal and can be used to sharpen knives of any steel including high carbon

opti clamps wholemilled angled fillet for hapstone r2 pair bestseller AS-9 series stones are madeHapstone Opti Clamps (Whole Milled Angled) the latest development of Hapstone for R2 knife sharpener. Opti is a fusion of Hapstone universal angled clamps (asymmetrical orientation) and Hapstone whole milled clamps (material and clamp shape). Opti Clamps utilize CNC milled superelastic duralumin alloy jaws with internal undercut for full flat grind blades. Opti Clamps can be combined with other Hapstone clamps of standard length. Opti Clamps can be