This Polyurethane jack pad snaps in place and will not fall out. It protects the mating surface between the jack and extension, preventing damage while not using the extension. The material will grip and form to surfaces better giving a more secure experience. Pad will NOT fit other brand jacks and will not fit on Pro Eagle jacks 2 years old or older. (2018 or older) The pad snaps into the plate on the jack itself and holds tightly. It does NOT snap tightly onto the top of the extension.