Ping Sealed Gear Mini 6-In-Line Screwless Chrome TunersPart number P2652 These sealed geared tuning machines with smaller machine buttons are for six-left headstocks. Mounting screws are eliminated by the use of sharp anchor spurs on the underside and the pressure from the threaded hex bushing. The 14 to 1 gear ratio provides incremental tuning.Features: Threaded Bushing Mount Shaft – 0.24″ / 6.1 mmBore – 0.40″ / 10 mm