We make (LASER cut) a simple wrench for a client. I have no idea why he doesn't buy something off the rack. It's about 10" long with 1-1/4" opening for the nut or bolt and the opening is parallel to the handle. Most modern wrenches I see have the opening at a 15° angle, which seems to hive you more options for grabbing the hex or whatever.
Anyone have an idea of when the 15° was introduced? I've seen old double ended wrenches with an S shaped handle that seemed to be going in that direction.
David