Features: Pre-lubricated, smooth, and flat bearing surface, compact structure, with strong bearing capacity and dust-proof, long service time. Single-row design, suitable for high speed, low friction, low noise, and low vibration, improve efficient and steady work. High temperature quenching forging, sturdy and durable in operation, these deep groove ball bearings combine radial load at high speed. Mainly applicated on wheels for cars, bikes, motorcycles, karts, lawn mowers, skateboards, roller skates, tractors, trikes, trolleys, etc. Specification: Model: 6301-2RS Material: Bearing Steel, Rubber Seal Type: Double Rubber Seal Color: Silver Tone Inner Diameter: 12mm / 0.47" Outer Diameter: 37mm / 1.46" Width: 12mm / 0.47" Static Load Rating: 10kN Dynamic Load Rating: 4.1kN Grease Speed: 1760RPM Oil Speed: 36000RPM Package Includes:10 Pcs Single Row Deep Groove Ball Bearings