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

Nothing to dislike they are the best. Im a roof contractor primary use is securing roof anchors for saftey harnesses, into a truss of course. First experience 7 years ago building a tree house. Requires little energy meaning extended battery life. Going into a harder wood the aggresive thread will pull the wide head half through the side of a 2x4 without effort. These screw are hard to find sometimes and Amazon has good prices if you shop the site. Repeat buyer every few months.

works like a charm

Screws do what screws are supposed to do. Hold wood together fine. Really big heads, but not flat underneath so predrilling thin veneer materials is a must. Cons: Did not come with driver bit in either box I bought. No response for over 3 weeks from seller on making that right or not. Now it is past return or claim cutoff. False advertising to say driver included then not provide. ONE star due to the above.

i use these screws for fastening kitchen islands to the floor,ive been using these screws for this for sometime,pretty much since they came out with them,they are perfect and amazing this is the first time having bought them online,,, i now find myself trying to figure out how to kick myself in the butt for not buying them here before ive been purchasing them at one of the 2 popular hardware/lumber chains since using them and it is the exact same product but at a fraction of the cost,,,,cant beat that

EXCELLENT

Love these and 20 percent cheaper than Home depot!

Works greats in softwood not so well on hardwood.

We no longer use lag screws for any application, these and the other structural fasteners by FastenMaster and others have made lag screws obsolete. No need to pre-drill in most applications and I have yet to break one or strip out a head. They are also stronger then lag screws that are 50% larger in diameter. I.E. A 1/4 Headlok is stronger then a 3/8 standard lag screw. Forget about these pulling out either, you will have to destroy the wood beam/header/joist before these will pull out.

Awesome fasteners. So much easier than pre-drilling and driving lag screws. Ive used the related LedgerLOK screw as well.

Great alternative to lag bolts