Bill Tindall, E.Tn.
When it comes to screwing tops to case pieces there is usually limited room on top of the screws to accommodate a conventional screwdriver. I do not know where I obtained this ratchet but it is perfect for the task of driving square head screws through frames and into tops. It has a male and female 1/4" square drive that accepts either a socket or a screwdriver bit.
Shown is using it to fasten top to table currently underway.....and done at last.