Pedro's Cassette Lockring Socket w/Pin Tool Description: Removes and installs cassette lockrings with aid from the included 5 and 12mm guide pins. Pins are conveniently held in place with a strong magnet for easy tool swaps. Designed for the professional mechanic and the home mechanic who appreciates quality. Alloy tool steel socket is fully machined to precise tolerances for an exacting professional-level fit Features a unique dual function design with 5mm pin and removable magnetic 12mm pin Extra-long splines for superior engagement, quick-spin knurling, a 3/8" square drive for use with torque wrenches, and a 24mm external drive Fits all Shimano, Sram, SunRace, SunTour, Chris King, and other HG standard cassette lockrings, disc brake lockrings, and other similar fittings with 12 splines and 23.5mm outside diameter