This shirt pocket handcuff key extension tool is 3-7/8" long with including key. The handle enhances use of the original key. It gives a standard key that is easily replaceable an extended length and solid grip. The extension shaft allows the user to manipulate the key by rolling the barrel between the thumb and forefinger. To replace the key simply unscrew the end cap and insert a new key. Includes 1 key and keyring.