... /spray 3)colour:according to customer required Roller, wheel, window roller, window wheel, door roller, door wheel, sliding roller, sliding wheel ... for UPVC/Aluminum window door1.Competive price .2.Nylon wheel ,iron frame.3.Run ... .5.orange color or according to you demand .6.surface treatments:powder-coated (silver, white, black etc.) or plating (imitation ...