Wide Application: Our precision steel bearing balls can be widely used in bearings, airplanes, motors, bicycles, motorcycles, automobiles, light rails, furniture, drawer slides, door locks and many other uses. Easy to carry: The storage box has a built-in partition space, which is not easy to to roll. It perfectly solves the problem of mixing different sizes. It is convenient to use. The practical storage box is easy to carry. Bicycles can always carry spare bearings to deal with any accidents. Meet Your Different Needs: 510PCS high-precision bearings, 11 component sizes can meet the needs most of the bearings in your life, it is not necessary to go to the repair shop, you can repair it at home. It will save you a lot of time and money High Quality Material: All bearing balls are made of high quality stainless steel, firm and never rust. The surface of the round ball is polished and smooth, without cracks, burrs and debris. If you lubricate on it, you can improve lubrication and prevent corrosion and rust. 510PCS 11 Sizes Steel Balls 510PCS high precision bearings, 11 sizes can meet the needs of most bearings in your life. You don't have to go to the repair shop, you can fix them at home. It saves you a lot of time and money. Easy to carry The storage box has space built-in separation which is not easy to roll. It perfectly solves the problem of mixing different sizes. It is convenient to use. The practical storage box is easy to carry. Bikes can always carry spare bearings to deal with accidents. High quality material All ball bearings Bearings are made of high quality stainless steel, which is strong and does not rust. The surface of the round ball is polished and smooth, without cracks, burrs and deposits. The oil on it can improve lubrication and anti-corrosion and rust.