Hi there. I also have a 1/2" drive Dowidat imperial socket set. A complete set i might say, but there is 8 imperial sizes that baffles me. They are 33&3/4W, 11/8F 11/16W, 5/8W (16), 9/16W (14), 1/2W l
(13), 7/16W (11) and 3/8W (10). To my knowledge the metric equivalent sizes are in brackets...