The 16SS INOX HYBRID STA-TITE is a heavy weight, ring-only Tecnoplast seat designed for universal-sized pans. It has special Hybrid Hinges™ that combine the benefits of both stainless steel and thermoplastic making the seat virtually unbreakable. The 16SS is perfect for high traffic areas like, schools, airports, railway stations, etc. This seat features STA-TITE: the patented fixing system that always stays tight and takes the guesswork out of installation. The lower portion of the nut shears off when the proper tightness is reached, so it is always perfectly tight.