4pcs 1.8mm Deep Metal V Groove Guide Bearing Pulley Rail Ball Wheel 5x24x7mm

Nylon Flat Belt Bearing Pulley Wheel.
Stable Bearing desgin avoids being sunk.Low noise . low vibration . high precision. stable performance and durable.High sealing performance . high operation performance.Widely used in transmission . instrumentation . electrical . household appliances . internal combustion engines . transport vehicles . agricultural machinery . construction machinery . engineering machinery . roller-skating shoes . yo-yo . etc.