12 ft. Straps Made to Fit All 10-11 ft. Square or Round Spa Tub Covers Part Includes (4) Locks, (4) Keys (2) Superloc Buckles for Adjustability Made in USA Black Polyester Webbing rated at 4,500 lb. Break Strength Key Turns 90 degrees to lock, Preventing Unfastening Easy Pinch Release; does not require key to open/unfasten ITW Nexus Plastic Buckle Hardware Lock Assures Product Retains Maximum Wind Resistance High-End Thermoplastic is Safe at Extreme Temperatures and Weather Conditions Keyed Entry Cannot be By-Passed with Simple Tools or Utensils ITW Nexus Superloc Buckle Allows Adjustability and Tightening of Strap Better Than Original OEM in Many Cases Also Available Fixed Length, With Adjustable Buckle Also offered with stainless screws and with cover corner protector pads