The Zak Tool ZT15 handcuff key extension tool with swivel enhances use of the original key due to the extended barrel length and keyring swivel feature. This allows the user to manipulate the key by rolling the barrel between the thumb and forefinger. To replace the key, unscrew the end cap and insert a new key. Replace the cap and its ready for use. Includes 2 keys and keyring. Length: 3.875" long with key.