General description 12 size precision steel balls assortment kit containing 600 pieces in total: 90 pcs of 1mm, 80 pcs of 2mm, 80 pcs of 2.5mm, 50 pcs of 3mm, 50 pcs of 3.5mm, 50 pcs of 4mm, 50 pcs of 4.5mm, 50 pcs of 5mm, 30 pcs of 5.5mm, 30 pcs of 6mm, 20 pcs of 7mm, and 20 pcs of 8mm. Made of 304 stainless steel, these balls feature uniform size, high wear resistance, high precision, and a smooth finish with no burrs, ensuring an exquisite appearance. They are widely used in various applications including auto parts, motorcycles, bicycle bearings, casters, and drawer slides. Additionally, they can serve as mixing balls for stirring paint, nail polish, and more. Technical specifications Material: Stainless steel Size of storage box: 10.01 x 3.99 x 1.30 cm Measurement allowed error: +/- 1-3 cm Other information The steel balls are coated with a small amount of grease to reduce friction during rotation and prevent corrosion and rust, thereby extending the service life of the machine.