Sold individually, this clamp plate for Kahler locking nuts has a roof shape with an offset hole and no threads. The clamp screw passes through the clamp plate and threads into the base. Only available in black.
There are 3 possible clamp screw types to choose from, 8440 is the standard button head with 3/32" allen key drive, 5440 has a cap head with 9/64" allen key drive that has the Floyd style but with the correct threads for Kahler locknuts, and finally, 5441 is 1/8" allen key drive, slotted and can be tightened with a coin.
Fits Kahler string director locking nuts (5511, 5521, 5522, 5537, 5538), they are not for the 5513 string locks.
Locking nuts (or locknuts) and string locks are two different types of locking devices that do almost the same thing.
Locknuts always sit at the end of the fret board and incorporate the nut, the slotted part on the neck where the string vibration stops. It's both a lock and a nut... it's a locknut.
String locks are slightly different because they are attached to the head stock downhill from the nut and is just the "locking" portion. In other words, they only lock the strings and the nut is separate so it's simply called a string lock.