FastenMaster FMHLGM412-250 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 250-Count,Black;

HeadLOK is a heavy duty structural wood screw that is ideal for many wood applications including deck framing, stair stringers, attaching rigid foam (SIPs), fences, kitchen cabinets and more. The HeadLOK flat head fastener requires no predrilling and offers higher design shear than 3/8" lag screws. The SpiderDrive System contains 8 points of contact, maximizing bit fit and reducing stripping. HeadLOK zips right in and creates a great finished look. 250 piece Length: 4-1/2" 3/8" lag screw replacement No predrilling Flat head provides great finished look Sharp gimlet point for fast installation into wood and OSB Aggressive thread for holding and withdrawal strength Patented SpiderDrive bit in every package Ideal for many wood applications including deck framing, stair stringers, attaching rigid foam (SIPs), cabinets and more.