I bought this to use on my 4 wheeler. pin clutch. This is suitable for both. Maybe I can get one for my lawnmower too. Before, my car's tongue would rub against my chain case if I cut too sharp, and now I can turn sharper. Also, I no longer have to remove the ball to pull the mower after mowing. I'll probably buy another one and mount it on the mower so it has a ball mount and pin. On my digital calipers it's .3215 or 5./16" thick and looks good.