The Union 4046 70mm x 51mm 4 Lever Till/ Drawer Lock Brass is 70mm x 51mm & comes with 2 keys & a push-in 5356 escutcheon. Security Fitting & Operation The lock is cut flush into the inside of the drawer front & the escutcheon is pushed into the keyhole on the outside of the drawer front. The deadbolt os locked & unlocked by the turn of the key. Maximum Drawer Front Thickness The keys supplied with the 4046 drawer lock are sufficient to accommodate a 32mm thick drawer front, any thicker & the key is unlikely to have enough reach to operate the lock.