I never knew what these sockets were for until I need square head lags for fastening my ironwork.
I was using regular hex or 12-point sockets for store bought lags that I modified to be square heads. All those sockets did was tear up the corners of the lags and ruin my work.
Then I found Blacksmith Bolt & Rivet Supply and their 8-point socket sets. Magically delicious!
Now my work doesn't get messed up and the installs go much smoother!
Thanks, Blacksmith Bolt & Rivet!