New 20mm(ID) 25mm OD / 24mm(ID) 30mm OD Castle Engine Lock Nut Socket 4 Pin for Kawasaki Zx1000 Zx10r Zx600 Zx6rr Zx6r Zx636 4-pin socket spanner tool one side is 20mm id and another side is 24mm id package include 1pc