Traditional thumbscrew-style locking functionality with gotoh technologyPull the string taught through the tuner hole, and with a twist of the thumbwheel the string is locked into the post Just a few turns of the tuner knob and youre up to pitch Since theres just a partial wrap of string around the post, tuning stability is dramatically improved Locking tuners are excellent for non-locking tremolo guitars, and for players that do heavy string-bendingRock Solid&trade string posts eliminate looseness and reduce backlash for improved tuning stability No more wobbly string posts to cause tuning problems Two post heights eliminate the need for string treesThe Lubri-coat&trade process electro-coats the gears with a special polymer layer This eliminates the need for oil and keeps the lubrication where its needed, for the life of the tunergotoh Sg381 Mg-T16:1 ratio10mm (1332) diameter pegholes required2 post heights: 185mm and 20mmRemovable metal knobsBlack finishThreaded hex bushings and mounting screws (6 each) includedSet of 6 in-line tuners