Metal worm screw for drain sewer rod. Easily breaks up obstructive materials and pulls out obstructions. A 50mm metal worm screw for use with a drain sewer rod. This high-quality screw easily breaks up obstructive materials and pulls out obstructions. Penetration - easily breaks up obstructive materials in drains. Removal - pulls out obstructions in order to unblock the drain. High-quality - metal lock rod connector made from crimped brass plating. Draper Worm Screw 50mm in Silver Brass.