Door/Window Permanent Hurricane Anchoring Kit. for use with shutter systems, plywood and metal panels. Kit contains: (40) 2-1/4" White Anchors, (40) 1/4-20 Washer Base Wing Nuts, (40) 1/4-20 White Vinyl Screw Protectors, (1) 3/16" Hex Nut Driver, (1) 3/16" x 4-1/2" Drill Bit. For Installation into concrete a 7/32" Drill Bit is needed but not included in package.