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External support in nylon, internal support in 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
External support in nylon, internal support in zamak; set screw, nut and adjustment screw in galvanized steel; roller bearings in hardened steel coated in nylon with fiberglass. Capacity 150 kg per sash
External support in nylon, internal support in zamak; set screw, nut and adjustment screw in galvanized steel; roller bearings in hardened steel; Wheels instanless steel. Capacity 240 kg per sash