These push-type retainers are made of high-strength plastic. They are snap-in retainers that are designed to resist corrosion, while their 'push lock' mechanism makes them a snap to install and remove. Perfect for attaching car door panels, fender liners, grills, or bumpers to frames, these retainers are perfect for day-to-day automotive maintenance duties. 9540D Head Diameter : 20MM Stem Length : 13MM Hole Size : 8MM