You are purchasing a digital download of the McCulloch 1-51 Chain Saw Illustrated Parts List. This list was published in April of 1960. The list has exploded schematics (drawings) of the entire saw an long with corresponding part names and numbers. McCulloch Parts List typically have 8 to 15 pages and give detailed drawings of the Engine, Starter and Crankcase, Oiler Tank and Fuel Assemblies, Air Box and Carburetor Assemblies, Power head Assembly, Bar and Chain Assembly, Tools and Accessories. Note that the preceding sentence states "typically" and there are slight variations from saw to saw. In any event you will have a complete breakdown of the entire saw. Please note that when ordering any parts list from me that I include all updates that I have available for that particular saw. For example: The McCulloch 1-61 Parts List was printed in both April 1960 and September 1960. I will include both of the lists on your CD so you will have as much information as possible about your saw. I have over 1000 different McCulloch and Homelite Chain Saw Manuals. If you don't see you manual listed, send me a note and I will check my files, if available, I will list and send you the listing number. You can contact me at vwmson@bellsouth.net