Check the listing for details. Genuine Grover Original Rotomatic 3x3 Nickel, Keystone Button. Condition: New. Listed at 51.86 USD. Genuine Grover Original Rotomatic 3x3 Nickel, Keystone Button P17Manufacturers Part Number: 102NK These guitar machines are a triumph in engineering and styling. The housing provides a maximum bearing for worm, gear and string post. Gear ratio is 14:1. Worm and gear are precision-cut for perfect meshing. This eliminates backlash and slippage. Countersunk tension screw permits player to regulate turning tension to any degree. Gear box has a special lubricant for lifetime, trouble-free service. Includes 5/8 washers, bushings and wood screws. All Grover Machine heads carry a lifetime warranty from the manufacturer. Buy with confidence from SportHiTech, an authorized Grover Dealer. All products are factory fresh and in original retail packaging.