This is the small woodruff key for the chain drive sprockets on TVR Speed 6 engine. This woodruff key locates the drive sprocket onto the shafts of the water pump. high pressure oil pump and scavenge pump on all TVR Speed 6 engines. There are therefore 3 per engine. This is not the woodruff key that locates the gears onto the high pressure oil pump or scavenge pump shaft.