... offer: HSS-DMO5,W5,W6,W9,M2,M42,Cr12mov etc.Specification:Out Diameterφ20-600mm,Bore Diameter5-60mmThickness:0.2~6 ... – Coating)The GOLFACE coating gives the blade a great surface hardness. The high oxidation temperature, together with other positive characteristics, ... problem.Bestface (CrN - Coating)Characterised by a high surface hardness and low friction coefficient (the lowest of all), this coating ...