General description M4 OC Turnbuckle Hook (Hook and Eye) made of 304 stainless steel. Package includes 5 pieces of M4 Turnbuckle Hooks. Waterproof, rustproof, and corrosion resistant. Ideal for tensioning ropes and regulating elastic effects. Compatible with steel wire, antennas, clotheslines, chains, and other ropes. Perfect for both indoor and outdoor use.