The Harmony Push Rivet pack contains 5 plastic push rivets. Push rivets are typically used to attach seat cushions and thigh pads, such as those on the Perception Joyride. Push rivets are removable, but may not be re-usable once removed. Length is 7/8 of an inch, grip range is 1/2 inch. Fits into a 1/4 inch hole. 3/4 inch head.