Standard Diameter: 7/16" / .4375 InchesMetric Diameter: 11.1125mmGrade: 25Material: AISI 52100 Chromium SteelBall Weight (each): .19778 Ounces / 5.607 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.