... hardness Have application in apparatus,meter and ball bearing etc Ruby Jewel BearingsGeneral DescriptionOur factory manufactures exact ... bearings, glass, microcrystalline glass, cubic zirconia, natural agate bearing, etc, Jewel bearings have application in apparatus, meter ... , substrates, thread-guides, coil-winking for machinery, nozzles, balls, etc. Supporting bearings ( Performance area):1. Type of ...