True mechanical lock- NO TOOLS REQUIRED.
What could be simpler? Just pull the string through the hole, tighten the lock using a coin or screwdriver, snip off the remaining string- give it a 1/4 turn and you're in tune!! NO slippage, a true mechanical lock. Add a pair of our roller string trees and maybe a graphite nut and you've removed almost all of the friction at the headstock. The result looks great, has no effect on the natural tone of your guitar and most importantly, keeps you in tune!
You get a complete set of 6 tuners with washers, bushings and setscrews. The 45 degree offset fits all standard Gotoh setscrew locations, and you need a 10mm hole to mount these.
This is for a boxed, full retail set of tuners!