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hangrollerH3 be used in the industrialsuspended door,coated with zinc with it's feature as follows: 1.For upper rail G1 2.Loading for 120kgs/pair 3.The diameter of the roller is 48mm. 4. galvanized steel,so the ability of anti-erosion,anti-rust is perfect.also it can be coated with chromium,and then it will be more beatiful in the appearance,and more firm in the feature.while the price is higer. 5.OEM and ODM is accepted,we can produce it according to your request. 6.It is a component of door,work with other door accessories,such as bracket,track,guide,upper railway,channel,door hemming,position,wheel,pulley,handle(stainless steel handle) sliding door