5 Pcs 683ZZ 3mm x 7mm x 3mm Skating Deep Groove Ball Bearings Mechanical Transmission Bearings Deep Groove Bearings

Size: 3mm inner diameter, 7mm outer diameter, 3mm width. Material: bearing steel. Durability and resistance to deformity under heavy loads.Rust and corrosion resistant,washable. Hardness 60-62°, high speed, low noise, high precision. Closed with metal shields to protect the bearing from dust or any possible contamination. Applicable to: all kinds of mechanical transmission, supporting motors, precision instruments, telecommunications equipment doors and windows pulleys, fitness equipment, toy car models, skateboard roller skating, fishing gear, aircraft model equipment, sewing machinery, household appliances, medical equipment, etc.