6 in line Original Sperzel Trim-lok machine heads - Sperzel Twist-lock Mechanism Super high quality construction (made in the USA). Just feed the string through the peg hole, and tighten the thumbwheel to keep your strings in position and in tune for longer. Set of 6 in-line machine heads. Complete with colour matched 10mm bushings and screws Ratio - 1:19 To fit 10mm tuner holes. Here's what Sperzel have to say:'This is the ultimate in tuning keys. The locking feature eliminates the need for multiple string wraps, and trem users no longer need a locking nut that deadens string sustain and all annoying Allen screws and wrenches. Tired of tying strings? This is the answer. This model is proven to hold strings tightly, allowing the guitar to stay in tune to improve playing enjoyment. The Trim-Lok is a mechanical type locking system that can be used on ANY guitar, including non-trem or acoustic.'
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