silding roller ;widnow wheel 1.Competive price. 2.Nylon wheel ,iron 3.Run smoothy. MOQ:2000/pcs. 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 smoothy.4.real bearing.5.orange color or according to you demand .6.surface treatments:powder-coated (silver, white, black ...