This innovative key set is the perfect try-out keys to carry for all occasions. It is fairly simple to use as it does not require the use of a separate tension tool, since the method of use involves a built-in tension. The set is for standard size keyways (including automobiles) and consists of 10 keys. Includes instructions. NOTE: This is a restricted sale item; you must agree to the Terms of Agreement for Ordering Locksmithing Equipment before ordering.