650 PCS 4 8 MM Steel Bearing Balls,Precision Balls

【Size】: There are six kind of ball diameters: 4mm(200pcs), 4.5mm(150pcs), 5mm(120pcs), 6mm(80pcs), 7mm(50pcs), 8mm(50pcs), a total of 650pcs. 【Material】: The steel balls are made of high-quality carbon steel, which is strong and wear-resistant. 【Package】: Steel balls are sorted by size and packed in transparent plastic boxes for easy storage and access. 【Characteristics】: The surface of the steel ball is round, smooth, unchangeable, and durable. 【Uses】: It is mainly used for bearings, casters, chains, scooters, motorcycles, bicycles and mechanical equipment.