Check the listing for details. Quarter Turn Pop up Vending Machine T-Handle + Gematic lock 0599C CHANGE KEY. Condition: New. Listed at 29.95 USD. Description: Including: one quarter turn T- handle + cam + inner cylinder lock+ 9 keys (1pcs Change key and 8pcs different key code) Screws are not included Please see the detail in attached drawing. This special feature has a master key lock system, it is good for more than one users.But it cannot open any of the lock with a different key code that you lose key, you should get a locksmith if you lose your current lock box key. Gematic lock Description: 1. High Security Tubular System 2. Housing & Barrel made of Zinc Alloy 3. Lock set: 1 piece of Change key and 8 pcs of Operating keys. Using the Change key to set the key code and using the Matching Operating key to lock and unlock. 4. Over 10000 key combinations. ADVANTAGE You buy one lock become 8 lock, and you have the Change key to control those 8 operation keys. How to use. Change key: Black cover Operating key#1,2,3,4,5,6,7,8 Use Black Change key to change a lock to a different operating number, insert Black Change key into the current operating position (#1) turn to (#4),and remove the Black Change key without turning it and insert the operating key #4 at the position 12:00(#1) Please feel free to ask question by sending us email. Please feel free to contact us, if you have any question.