High-quality materials: these 6004- deep groove ball bearings are made of robust, high-hardness, heavy-duty steel to long service life and reliability. Double sealed design: equipped with removable double-sided dust seals, these 6004- bearings effectively prevent lubricant leakage and block foreign matter such as sand, dust and water. High design: each 6004RS bearing undergoes testing to minimal dimensional error, smooth rotation and low operating noise. Wide applications: these deep groove ball bearings are suitable for inline skates, roller skates, scooters, skateboards, and a variety of small appliances. They can also be used in motors, fans, pumps, instruments and other DIY machinery, offering versatile compatibility for hobby projects, workshop builds and repair tasks. Package included: you receive 10 pcs 6004- ball bearings with inner diameter 20 mm, outer diameter 42 mm and thickness 12 mm, meeting common replacement and upgrade needs. Whether for DIY lathes, 3D printers or regular equipment maintenance, this set provides stable, reliable and cost-effective performance., Weight: 1.433004703 pounds, Manufacturer: Xnuiasqe