Connector Straps provide a great backup security for Training Halters, Infin8 Halters, Balance Harnesses and Car Harnesses. Connected from a D Ring on the Harness or Halter back to the dog's collar it helps prevent those "houdini dogs" from effecting their escape. Connector Straps offer Security for working with... Very strong dogs Difficult temperament dogs Dogs with aggression issues Dogs with a history of chewing or backing out of halters and harnesses Dogs with very fine coat, where the hair offers no grip to the straps on a harness or halter. SIZES:Mini: for use with Mini & Small Training Halter, Size 1 & 2 Infin8, or with Mini & Small size Harnesses. Regular: for use with Medium & Large Training Halter, Size 3,4 & 5 Infin8, or with Medium & Large size Harnesses. LENGTH from end of snap clip to end of webbingMini - 15cm Regular - 20cm