Pedro's Pro BB Socket Holder II. Features: Holds socket to BB axle to prevent slipping. Update spring preload allows for increased flexibility and rotation during use Updated design works with square taper and splined axles with M8, M12, or M15 internal spindle thread Use with Pedro's socket handle PD-3550 Specs: Model:X9.93 Speed:9sp Size:11/128" Width:6.6mm Links:116 Color:silver/black Package:each