Standard Diameter: 2 / 2.00 Inches. Metric Diameter: 50.8mm. Material: AISI 1010 Carbon Steel. Ball Weight (each): 1.185 Pounds /. Carbon steel balls are used in automotive applications, for semi-precision bearings, and in commercial applications such as casters, locks, and drawer slides. Other applications for carbon steel balls include locks, bicycles, roller skates, slides, trolleys and conveyors.