Toggler alligator, 20 pack, 5/16" diameter, af8 flanged solid wall anchors with 20 #12 x 1 3/4" screws, versatile & easy to install, works in any building material & many different sizes & types of screws can be used with the same diameter anchor, replaces plastic plugs & screw anchors as well as metal masonry screws & wedge anchors, out holds metal anchors of comparable size for a fraction of the cost. Furthermore, special corrosion proof polymer absorbs shock & vibration.