Olympus T37 T-bolt style Desk/Drawer lock, can be used a replacement for C8137 National drawer lock - please review attached pdf document. Keyed Different, and Keyed Alike Stock codes normally ship in 1-3 days. Keyed Alike Random codes will ship in 1-3 days if our choice. Special key number requests - lead time will vary - please inquire. Keyed Alike Pairs - please order in multiple of two, ie. quantity of 2,4,6,8... Locks are priced and sold each, regardless how they are keyed.