FastenMaster FMHLGM412-50 HeadLok Heavy Duty Flat Head Fastener, 4-1/2", 50-PkIdeal for fastening a variety of wood applications. Spider Drive offers highest level of bit engagement and drivability, chamfer under head for increased strength, wafer head eliminates need for washer. Spider Drive bit included. 4 1 2" No pre drilling required Non countersinking head Removable Patented spider drive system Great for installing decks, fences, headers, kitchen cabinets and any wood to wood connection ACQ approved 50 Pack.