Schlage DND Key SC20
This style of key has a neuter bow head (looks like a block) with "DO NOT DUPLICATE" engraved on one side of the key. The other side of the key is blank.
The SC20 keyway is also known as an A1145L or "Schlage L Keyway". The SC20 Key is a 6 pin key. If you need the 5 pin version of this key click here.
The SC19, 1145L (5pin) and SC20, A1145L (6pin) keyway is the master keyway for Schlage. It fits/overrides the following Schlage keyways C, CE, E, EF, F, FG, G, H, J, K.
In short, if you are out of stock on any of those keyways you can use the SC19/SC20 in it's place!