... good quality Chrome stee balls AISI52100Universal material for ball and roller bearing industry.Chrome steel ... (4")Grade Available: G5, G10 - G1000Application: Universal for many application. For example: balls &roller bearings, Linear montion, Balls lead ... Available: G40 -- G1000Application: Moderate loads and alow rotatingparts, for example: castors, conveyors, rollerskates, drawer slides, seat ...