Review on 🔩 Grade Flange Screws J I S Assortment: Superior Quality Fasteners for Secure and Reliable Connections by Robert Rick

These are not oil lubricating screws, class 10.9. Have them because they are lockable, spin freely, and don't need extra washers. Easy to install in hard-to-reach places. It's also cheap enough for me to use at home. The only complaint is that a 2" piece broke off in the clear box. Insert some cardboard to fill the gap and it will work.