M_Boats: wet locker drains

Because my boat is over 200 miles away right now . . . What is the diameter of the vertical holes, I guess you could call them "drains", that allow water to pass from the M17 cockpit to the wet locker, and vise versa? The actual drains (to thru-hulls) are in the wet-locker itself, so I'm not sure what I should call the holes from the locker to the cockpit. My M17 is an '84, and I don't know whether the holes would be different on post-'80's models. My deck is Jerry's redesign, with the wider transom and no outboard cut-out. Thanks!