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 and load at high speed. Mainly applicated on wheels for cars, bikes, motorcycles, karts, lawn mowers, skateboards, roller skates, tractors, trikes, trolleys etc. Specification: Model: 6203-2RS Material: Bearing Steel, Rubber Seal Type: Double Rubber Sealed Inner Diameter: 17mm / 0.67" Outer Diameter: 40mm / 1.57" Width: 12mm / 0.47" Static Load Rating: 4.6kN Dynamic Load Rating: 9.6kN Grease Speed:14000RPM Oil Speed: 17000RPM Package Includes:2 Pcs Deep Groove Ball Bearings