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External support in nylon; internal support, set screw, nut, screw and balancing shaft in galvanized steel; ball bearings made of hardened steel coated with fiberglass nylon. With wide base bearings, capacity 90 kg. Per sash
External support in nylon, internal support in galvanized zamak; set screw, nut and adjustment screw in galvanized steel; roller bearings in hardened steel coated in nylon with fiberglass. Capacity 180 kg per sash
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