Has 24mm centre hex that fits the included HG type cassette removal tool. It also works for Centrelock type rotor removal. This Pro quality cassette remover is made of Chrome Molybdenum and Nickel plated and has a removable high carbon steel rod spigot to locate and hold in place in the axle while using. As well as the 24mm hex outside it also has a 1/2“ square socket so you can use a ratchet or torque wrench. 

   I use Riderace tools myself and highly rate them for their excellent quality for price point. This pair of pedal spanner + cassette removal tool is the only one like it on eBay, similar cassette removal tools are £15 on their own. Posted in England so quick delivery.