1.sliding door double wheels 2.iron body+nylon wheel+608zz bearing ... wear and tear 4.Low noise & colorstay 1.Name:double wheels for sliding door,sliding door roller2.Material: iron3. ... demand.We are professional manufacturer of window door hardware accessories (roller, hinge, lock, door clip etc.), being in this ... reliable quality and afer-sale service. iron body,double wheels roller for sliding door