... durable. Heavy duty stainless steel frameless glass hinges for glass folding door SA8500H-7 1)1. Material: SUS 304 stainless steel,nickle >82. ... manufacture that special in producing sliding door ,swing door,moving gate,folding door ,glass hinge,spider,handle lock patch ... Test the using life of sliding door systems & max. weight of the sliding door rollerSalt spray test machineCorrosion resistant ...