This sleeve is used with the WHLA7 axle. Specify the wheel and axle the sleeve will be used with to receive the correct premachined length. Default length for MH Series ball bearing wheels is 2.02 inch. Specify 0.90 for W50/51CC.75 or 1.10 inch for W60CC.75. A length of 0.73 can also be used with the MH series wheels on the WHLA8 axle.