Standard Diameter: 1-1/2" / 1.50 InchesMetric Diameter: 38.10mmGrade: 500Material: AISI 1010 Carbon SteelBall Weight (each): 7.9708 Ounces / 225.967 GramsCarbon 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.