Standard Diameter: 1/4 /. Metric Diameter: 6.35mm. Material: AISI 1010 Carbon Steel. 036897 Ounces / 1.046 Grams. 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.