Motion Pro 08-0247 Valve Spring Compressor Improved quick action design The inner step diameter is 17 millimeter outer step diameter is 21 mm Both cup type and ball type tips are included Accepts Motion Pro adapters (08-0248) as well as Honda OEM adapters 07GME-KT70200, 07JME-KY20100, and 07959-KM30101 for use in shim under bucket and small diameter valve spring keeper applications Used in same applications as Honda tool 07757-0010000 and Kowa tool AKS-215-1010 OEM tools