... /spray 3)colour:according to customer required Roller, wheel, window roller, window wheel, door roller, door wheel, sliding roller, sliding wheel for UPVC/Aluminum ... .6.surface treatments:powder-coated (silver, white, black etc.) or plating (imitation gold,chrome,nikel)7.Loading capacity:75kg.8 ... for sliding windows and doors.if you are interested in our products ,plz do not hesitate to contact us ...