This is a New Clutch Alignment Tool for IH Farmall tractors 706, -1486 .This tool measures : pilot dia. .787", 1st slpine dia. 1 3/16" 11 spline, 2nd spline dia. 1 3/4" 17 spline. Check out my store for other IH parts. I have over 25 yrs. experience of rebuilding IH tractors and motors and have many parts available . Email your questions and I can probably help you. Thanks for looking.