304 Stainless Steel G100 Precision Bearing Balls Fits 6mm / 0.24 Inch 100 PCS por | ago 9, 20265pcs 30mm Bearing Balls 304 Stainless Steel G100 Precision Balls，30mm/apr.1.18″ Precision Bearing Balls. Precision: G100(Tolerance: +/-0.005mm). Size：30mm solid steel round balls, precision bearing balls.