With this tuner the string is locked in the shaft by a handy knurled nut located on the rear of the peg head, resulting in a low overall height. 6-in-line models with two different shaft lengths (staggered). Gear ratio 1:16.2. Pin lock Schaller was the worlds first manufacturer who developed the locking tuner and had it patented more than 20 years ago! Works like a traditional machine head, but the string neednt be wound up any more. Instead it is inserted into the cam holewith the clamp screw loosened, locked with the clamp screw and can then be tuned at once. This makes changing your strings a lot faster and easier. Only this patented locking system based on the ball socket principle prevents reliably from string notching and breakage. The string will not be wound onto the shaft any more. So it will stay in tune extremely well, perfect for non-locking tremolo systems. With all its benefits the Schaller locking tuner is THE benchmark in the guitar sector!