The Whites Clutch Lock Nut Tool is a special tool designed to loosen and fasten the lock nut when removing or installing the clutch. The two tool in one design has a 25mm on one end and 30mm on the other both with a 1/2 square socket drive on the inner for use with a torque wrench for accurate installation. Constructed from heat treated steel for durability and a black oxide finish for corrosion resistance.25mm and 30mm ends1/2 square socket drive on each endHeat treated steel constructionBlack oxide finish Fits: Honda Z50 1969-1981 2007 Z50R 1982-1999