BikeMaster Crank Case Separator Tool SetDesigned to separate vertically split crankcase halves on 2 and 4 Stroke engines. Adjustable arms allow this tool to be used on multiple bolt patterns found on a variety of makes and models of motorcycles. It is constructed of industrial grade steel with black oxide finish for long service life. It comes with 8mm mounting bolts and 6mm adaptors and a protective carrying case.