🔹Construction: Reinforced steel frame combined with a smooth roller (pulley) system.
🔹Mechanism: Directly fixed to the wall base or edge of the electrical box using screws or springs.
🔹Material: Stainless steel or plated steel, rollers made of engineering plastic or wear-resistant metal.
🔹Application: Pulling electrical wires, network cables, and fiber optic cables through in-wall conduits.