Steel Body With Weatherproofed Finish & Die-CastSheaves & Life Lube Bearings PU Wheel Caster sliding windowpulley

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economical pulley  Sliding Sash Windows pulley OEMPulley Bearing ODM Pulley Bearing sliding doorwheel 
suitable for coastal locations. Maintenance free,durabilityby design

u groove wheel roller 

non standard PU metal Roller Pulley skateboardcaster