Regarding NATOs...yes, they do have a tool watch appearnace...AND they’re safer for your watch [head]. A spring bar fails when utilizing a bracelet and/or conventional strap/band...DANG...the watch head will most likely hit the deck and the movement/case/bezel/crystal could be damaged. A spring bar fails when utilizing a NATO...SWEET...you still have another spring bar preventing the watch [head] from hitting the deck. Spring bars fail...not often...but they do fail.