FastenMaster FMHLGM006-250 HeadLOK Heavy-Duty Flathead Fastener, 6 Inches, 250-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