Not screws I had in boxes, but screws I have recovered from other projects. I did need to purchase 3 1/4"x4" lag screws for the gate.

Not screws I had in boxes, but screws I have recovered from other projects. I did need to purchase 3 1/4"x4" lag screws for the gate.

What you need, sir, is a Lego/OpenCV based screw sorter.