Fits Standard 1 Wrenches: Measures 1" in diameter. Expandable to ONLY fit most standard 2.3-2.5cm round flat spanner heads. Does not fit car, motorcycle or boat ignition keys Great identifiers: separate and organize your similar keys by color to identify them faster.Extremely time-saving for those who tend to mix up different keys . Flexible and Soft: Made of rubbery vinyl that resists tearing and fading.Ple material allows it to stretch easily to better fit your keys without cracking. Easy to use: Extremely easy to put on/take off the keys. They can be firmly attached to your keys without slipping. Ideal for preventing noise caused by a collision. 36 pieces in 9 colors: packed with 4 key caps respectively for each color out of 9 assorted colors A coding system by made to mark multiple keys. "