The 2AKDDTP Kit contains Pan Head Square drive screws and is suitable for use in solid/hollow wall, concrete, block, and brick applications. When used in hollow walls, such as drywall or plywood, the yellow wings will splay out to provide a more secure installation and higher pull-out load. The anchor has a lip to prevent falling into deep holes or hollow walls. For hard wall applications, use the size of the anchor to determine hole size for installation. For drywall or soft applications, it is recommended to use the smallest hole that will enable a tight fit for the anchor. These anchors are not recommended for use in overhead applications or where holding values are critical. It features yellow wings Provide Extra Holding Power in Drywall, Tapered, Ribbed for Increased Grip Strength.