1.3.936 CARBON BICYCLE stel balls 2.Material: Gcr15/ AISI 52100 / 100Cr6 3.Precision Grade: G10 4.Diameter: ... abrasives 0.07Max0.06Max55-63AISI521000.90~1.051.35~1.650.15~0.350.25~0. ... Max0.040 Max0.0358-651)material:AISI10102)Size:3.9363)Grade:G10004)Hardness: Hrc 61--665 ... wearing, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, ...