Alligator® all-purpose anchors replace those little blue and grey conical plastic anchors that everyone users, but are notoriously weak and flawed in design. Alligator® anchors are designed to hold high loads in solid walls, ceilings, and floors but also to hold securely when they encounter an unexpected cavity, such as in hollow brick, hollow block, or even in drywall and, especially, in tile over drywall. The specially formulated polypropylene body flows into and locks up with any undercuts in the hole, bonding the screw to the wall and sealing the hole to prevent moisture from entering. Optimal holding values are obtained in highly dense substrates by using a screw diameter and a drill diameter of the same size as the anchor diameter. The anchor is sold with a flange (also called a lip) for use where a cavity is anticipated (drywall, hollow brick, etc.) Additional sizes and non-flanged (lipless) versions are available via special order by speaking with your friendly Hardware Everywhere sales representative.