all of my toys came with cat1 pins,my tractor has cat2 tph,i installed the pats quick change system,the first time using my cutter, the adapter on one side was lost.so i decided to eliminate that problem by installing cat2 pins on everything i use,i also went one step further by welding large homemade washers on the end of the pins this made hooking up easier.the replacement pins came with the same size mounting stud so you don't have to drill out the holes and i paid about $5.50 per pin but it was well worth the cost...