Kluson has stepped out of the shadows! Introducing the NEW Kluson 19:1 ratio locking tuning machine. These state of the art locking tuners are designed for usage on contemporary guitars and utilize an individual mounting hole location offset at approximately 7 O'clock or 4 O'clock depending on left or right handed application (bass or treble side). Uses the common modern 25/64 in. (10mm) peghole with a hex head type screw-in bushing and single mounting screw. All mounting hardware is included.