Material: 304 Stainless Steel To connect and convert aquarium hose. With hose fasten node to prevent chance of hose loose. 3 types available: 12mm or 16mm adapter 16mm or 22mm adapter U shape connector. Great kits for your aquarium tank! Specification: 12 or 16mm Adapter Size : Approx. 5cm or 1.97 inch 16 or 22mm Adapter Size: Approx. 5cm or 1.97 inch U Shape Connector Size: Approx. 4x3cm or 1.57x1.18 inch (LxW) U Shape Connector fit 4mm or 0.16 inch internal diameter pipe Package Includes: 1 Piece Connector (2 Pack) Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color of the pictures and the actual item.