For 100 years, Waverly Tuning Machines have represented the pinnacle in design, function and style. To celebrate our centennial, we've created our very special Anniversary Collections: tuning machines with matching bridge pins, endpin and strap button. Precisely machined and highly polishedThe Butterbean Anniversary Collection in Ebony pairs nickel Waverly machines with metal Butterbean knobs and bridge pins, end pin, and strap button that are precision-machined from genuine ebony for a clean and classic look. They work perfectly and are the finest you can buy. The Waverly Anniversary Collection in Ebony includes: Tuning Machines with metal butterbean knobs: The choice of renowned guitarmakers for their finest instruments. Waverlys feature old-style tapered 1/4"-diameter string posts and press-fit brass hex bushings that fit 11/32"-diameter pegholes. Stainless steel worm gears with 16:1 gear ratio. Screws included with this set of 6 for 3+3 solid pegheads. Ebony Bridge Pins: Set of 6 unslotted pins, precision-machined to a 5-degree taper. Ebony Endpin: Precision-machined to a 5-degree taper. Ebony Strap Button: A beautiful addition to your neck heel, ours have a unique countersunk brass bushing to protect the button against overtightening. Button diameter is 17/32" (13.28mm), and button height is 7/16" (11.11mm).