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Galvanised steel nut, set screw and adjustment screw; roller's body made of nylon, ball bearings. Capacity 45 kg per sash, 1 bearing, 3 positions
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