TheUltimate Auto Wedgesare designed for smooth, safe insertion and will not fall into door cavities. The special angled tips allow for easier insertion and the sure-stop edges stop you from pushing these wedges in too far. These wedges feature a special tapered body that prevents them from popping out, and the special “illumination hole” holds yourprobe lightin place at any angle.3/8-inch (9.5mm) maximum thickness. Yellow color. Sold as a pair.