GRK RSS384HP RSS HandyPak 3/8 by 4-Inch Structural Screws, 50 Screws per Package
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11/16" is the diameter of the head.
Selected User Reviews For GRK RSS384HP RSS HandyPak 3/8 by 4-Inch Structural Screws, 50 Screws per Package
On a 54'x16' deck, I used these to mount a ledger. I looked into a number of different options for making a connection. The washer-like heads have cutters on the back to countersink the heads, which makes them really cool. I was able to set joists directly over the lag screws and align my deck joists with my house floor joists as a result. They are also very easy to drive.
These items are incredible. With an impact driver, it's simple to get in. Compared to the old lag bolts, this is a much better technology.
When a lag screw is required, these are the screws to use. I use a larger washer for added holding power, and I like that they don't require pre-drilling. Almost any application will benefit from these.
It has a lot of holding power and is very simple to use.