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: 636ZZ Material: Bearing Steel Seal Type: Double Metal Shield Color: Silver Tone Inner Diameter: 6mm / 0.24" Outer Diameter: 22mm / 0.87" Width: 7mm / 0.28" Static Load Rating: 0.33kN Dynamic Load Rating: 0.013kN Grease Speed: 30000PM Oil Speed: 36000RPM Package Includes:10 Pcs Single Row Deep Groove Ball Bearings