GROVER 102N ORIGINAL ROTOMATIC GUITAR TUNERS 14:1 - NICKEL PART No: 102N 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.  Complete in retail boxFor standard guitars, Set of 6 (102N Nickel). Fits into a 10mm hole. - See spec diagram for more details - Fits most guitars without modification. GROVER'S LIFETIME GUARANTEE Grover are known and trusted all over the world for making one of the best tuners available and proudly say..... ' Should your Grover tuners ever fail, for any reason, simply return them to Grover for a fast and friendly no charge repair or replacement... '