FastenMaster FMHLGM412-50 HeadLOK Heavy-Duty Flathead Fastener, 4-1/2 Inches, 50-Count

These are EXCELLENT! Ive built my deck with them, well the support portions - all 2x12 and such. These can take the abuse of a 1/2 horse drill and hammer drill, and just pulls the boards together perfectly. Always going to be using these from now on!

use w a powerful drill/driver. drill a pilot hole when necessary (rarely) to prevent splitting... I use them for framing, for restoration. Clamp a sister to exstg pc, drive 2 or 3 Timberloks, then you can undo to adjust position or re-cut. When its right and tight, Ill nail the pieces - maybe leave TLs in or remove them for reuse. They can be driven in places where you cant swing a hammer.

These are really great fasteners! I used them building a pavilion next to my pool and they worked perfectly! I like the star head, never slips. Just wish they werent so darn expensive!

These screws are absolutely awesome and very strong

Building a fence.

Great product, works extremely well. Will buy again.

...and a retaining wall of pressure treated 6x6 lumber. The result is so solid I know I wont need to redo it in the future.

great screws. I used these to secure pieces of 2x4s when building shelves. I did have to drill pilot holes when screwing near ends of the lumber as the screws split the wood when I didnt drill pilot holes

They are the best I have ever used. I used them on a deck they also look great.

Great value and excellent screws. Performance is exactly as advertised. We used them to assemble raised beds and a surround for our shed. Definitely use an impact driver for efficiency.