FastenMaster FMHLGM278-500 HeadLOK Heavy-Duty Flathead Fastener, 2-7/8 Inches, 500-Count Nationally code compliant stronger design shear values than 3/8 inch lag screws No predrilling--zips right in Patented Spider Drive virtually eliminates cam-out Guaranteed corrosion resistance for the life of the project; ACQ approved Free Spider Driver bit in every package