A friend of mine let me borrow his Tamron SP AF90mm F/2.8 Di 1:1 macro lens. Wow, what a cool lens. This screw happens to belong to a fan that I broke recently by accidentally knocking it off of our window sill. We had a couple of really hot days last week and sleeping without a fan was not fun.
I recently learned the difference between a phillips head and a pozidriv (or supadriv) head. This is a phillips screw head