The Quick-Pin changes the way you think about unhooking implements. The Quick-Pin has a top sleeve held by a locking pin, a huge improvement over the regular hitch pin. The top sleeve is able to come apart by removing the locking pin, leaving just the shaft in the hitch, so that when the pressure is released the shaft will fall down through the hitch.
The reason for this design is for when the pin is pinched and cannot be pulled out because of the pressure on it or just for easier unhooking with one man operations. With the Quick-Pin, after the top sleeve is removed you can get back in the tractor to release the pressure on the pin, and the shaft will fall out using gravity as it’s advantage.