TimberLOK 3/16 in. 2-1/2 in. External Hex Drive, Hex Head Heavy Duty Wood Screw (50-Pack)TimberLOK is a heavy duty wood screw available in a variety of lengths and packaging sizes. Lengths such as for attaching rafter or trusses to top plate, landscape timbers, fences, decks, headers, stair stringers, and more. A free bit is included in every package. No predrilling Faster and easier than 3 8 lag screw Countersinking head style Guaranteed corrosion resistance ACQ approved IBC IRC code compliant ICC ES ESR 1078 Unique tapered head