Stainless Steel Torx Drive Flat Head Double Lock Screw for exterior use - these 1 5/8" long fasteners are the best I've ever used for 5/4 decking. Double ThreadLok™ design pulls and holds boards tight, preventing screws from backing out as lumber dries out. Ribbing on the seat of the screw head allows countersinks the screw without mushrooming. Torx plus drive means better grip with power drivers and less stripped screws. Suitable for marine and industrial applications where corrosion resistance is important.
I have a few 1 lb boxes in stock. Future sales will be in pails only.