I have a question about hole saws.
I am looking into buying a 5 1/2" hole saw to make armboards for my turntable.
I am curious how these things are measured. The hole for the arm board is EXACTLY 5.5", the Technics armboard measures 5.469" and I would not mind if it were a tiny bit looser, but it cant be 5 1/4" because then it the mounting screws will be too close to the edge
So how are holesaws measured? Ar ethey the diameter of the hole (which would leave the puck smaller) or the diameter of the puck? or the average?