Feature●490pcs 6 size precision steel balls assortment kit contains:4pcs1/2",6pcs3/8",50pcs 1/4",50pcs 7/32",80pcs 3/16",100pcs 5/32" ,100pcs1/8",100pcs 3/32".●Made of high hardness durable chrome steel.G10 level.Uniform size, high wear resistance, high precision, smooth surface, no burr, exquisite appearance.●Widely used in auto parts, motorcycles, bicycles bearings, casters, drawer slides etc. It can also be used as a mixing balls. Used to stir paint, nail polish, etc●The surface is coated with a small amount of grease to reduce friction when the bearing rotates and prevent corrosion and rust.Will reduce the damage to the machine and extend the service life.●Storage box packaging. steel balls are sorted by size . There are explanatory drawings. Easy to identify and store.Description