Suitable Material: The diving regulator port screw is made with fine copper that is wear-resistant, anti-rust and anti-corrosive. Leakproof: The diving stopper is equipped with rubber sealed ring that ensures the better leak-proofness. Different Size: There are two different size of the stoppers that is used for two different situation; one is for low pressure and the other is for high pressure. Professional: The bung is professionally made with high requirement that will fit the diving equipment better. Easy to Take: As the tools are of little size, so we can take them in boxes or bags to any places that need them. Specification: Material: Copper + Rubber. Color: Shown as Picture. Size: High Pressure Screw Size: Approx. 1.3x1.3x1.05cm/0.51x0.51x0.41inch. Low Pressure Screw Size: Approx. 1.4x1.4x1cm/0.55x0.55x0.39inch. Note: There might be a few color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece Diving Regulator Port Screw