Mayfair STA-TITE Toilet Seat Fastening Hardware Upgrade Kit, STATITE UPGRADE: Use any Easy Clean & Change Seat to STA-TITE with the STA-TITE Hardware Upgrade Kit STA-TITE Seat Fastening System Never loosens and installs with ease PRODUCT DIMENSIONS: bolt 3/8" x 2-1/4" and residential nut 3/8" COMPATIBLE: Can be used with Flip or Twist Cap Hinges COMPATIBLE: Use with all Easy Clean & Change toilets by Mayfair, Bemis and Church PROUDLY MADE IN THE USA: With Earth friendly materials and processes