Medeco Double Cylinder Deadbolt (keyed both sides) - Excellent Security & one of the most Bump Proof locks on the market. Deadbolt is supplied keyed different with 2 keys. Keyway - Air is the old Medeco commercial keyway that most Locksmiths can duplicate in-shop (no waiting on keys) - if you are not concerned with key duplication or control - this is a perfect solution. Medeco M3 keyway is the newest Medeco technology. Most Locksmiths can order these keys with the use of the supplied credit card (for key identification) - expect up to a week delay for extra M3 keys when they are not ordered with the lock. Deadbolts are designed for 1-3/4" thick doors - special adapters are needed for thinner doors. Please see attached pdf file for more details. Standard lead time is 1-2 days for processing. Keyed alike locks expect 2-3 days minimum before shipping.