Ultralite Clover Key Weighs Up To 50% Lighter Than Standard Tuning Machines. Sold individually. 9/16" Peg Hole, 3/8" Winding Post. Chrome Finish. Treble Side Heavy zinc bass tuners add unnecessary weight to your headstock, straining your neck and shoulder. It also restricts your left hand to holding up an unbalanced instrument, robbing you of the necessary freedom of motion so essential to a natural, relaxed playing technique.