KLUSON PRESTIGE 3X3 VERTICAL MOUNT TUNING KEYS Open Bronze Gears Parchment Plastic Buttons NICKEL These tuning machines are created especially for drop in replacement of old Kluson tuning machines from the 30's and 40's with a 1/4 in. string post diameter. While they look the same, they feature a diecast base, bronze ring gear, stainless worm gear with close tolerance bushings, and 18:1 gear ratio. For solid headstocks with vertical mount. Specifications: Base Plate material= Zinc Diecast Worm Gear material= Stainless Steel Ring Gear material= Bronze Gear ratio= 18:1 String Post Orientation= Vertical for drilled Pegheads String Post Overall length= 1 1/16 in. (27mm w/ domed top) String Post Diameter= 1/4 in. (6.35mm) String thru hole location= 13/16 in from baseplate Mounting hole spacing= 24mm (Vintage Kluson) Configuration= 3 + 3 Mounting hardware included= screws and bushings Bushing Dimensions= 6.5mm I.D. / 8.75mm O.D. Bushing Type= Hex head push-in Manufactured by Kluson Manufacturing Company #KP24-3V-NP