Standard Diameter: 1-3/4" / 1.75 InchesMetric Diameter: 44.45mmGrade: 100Material: AISI 52100 Chromium SteelBall Weight (each): 12.64 Ounces / 358.338 GramsChrome steel balls offer the precise geometry and fine surface finish that makes them especially useful for bicycles, casters, drawer slides, door locks and many other applications.