A Universal sprocket counterhold tool with special, removable, Mini-Pins for holding the high pressure fuel pump when tightening the slotted bolts on common rail engines. Also used to hold the sprocket when loosening or tightening the cam sprocket center bolt (Pre 2004) or cam hub slotted bolts (2004+ BRM PD and common rail engines). Essential for diesel timing belt changes. Useful for holding any sprocket that has spokes with holes larger than about 17 mm, including gasoline cam and intermediate shaft sprockets. If you already own one of our blue or green-handled Sprocket Busters, see our MNRUKT update kit below.