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

These have become a staple around our property! They work great and we have purchased multiple lengths. You do need an impact drill.

good product, like the head

Worked great

These things, in any length are great, work well and hold awesome!!!

They worked great.