https://www.drumclosure.com/products/drum-locking-clamp-ring/ As one of drum locking ring manufacturers, XEAL® drum lock ring, drum lock ring, drum bolt and drum lugs provide a comprehensive sealing solution for plastic and metal open head drums. Drum clamp ring is suitable for both steel and plastic barrel lock system, while bolt type locking ring is commonly used on metal oil drum lock. Size of barrel ring clamp, drum lock ring, and drum bolt are variable to fit containers of different volumes. Surface of this drum locking ring clamps is galvanized to meet anti-corrosion requirements under strict storage conditions. Instead of standard locking ring clamps, customized sizes are also available on request.