The Pro Cassette Lockring Socket begins as a solid piece of alloy tool steel, then is fully machined to precise tolerances for an exacting fit you won't find anywhere else, and finally is optimally heat treated for maximum strength and longevity. Designed with the professional mechanic in mind, the extra-deep splines ensure superior engagement while the quick spin knurling provides speed and control. Use on your Grande Torque Wrench for proper torque or use with our Pro Socket Handle or Equalizer Pedal Wrench to remove that stubborn lockring requiring a little extra leverage. Backed by Pedro's lifetime warranty. - Alloy tool steel socket is fully machined to precise tolerances for an exacting professional-level fit and optimally heat treated for maximum strength and longevity. - Features extra-long splines for superior engagement, quick-spin knurling, a 3/8" square drive for use with torque wrenches, a 24mm external drive for use with Pedro's Pro Socket Handle and pedal wrenches, and a 19.8mm internal diameter with 21.5mm depth. - Fits all Shimano(R), Sram(R), SunRace(R), SunTour(R), Chris King(R), and other HG(R) standard cassette lockrings, disc brake lockrings, and other similar fittings with 12 splines and 23.5mm outside diameter including some RockShox(R) suspension fork top caps.