The Prop Master wrench tightens all 1-1/16" propeller nuts without stripping them. Made of high-tensile-strength nylon, it's designed for OMC motors over 40 hp and Mercury motors over 50 hp.
I believe this is a "cool" tool to keep in the boat for emergency prop replacement so you can put your spare on if you "whack" your main prop badly enough so it needs to be changed to continue on. This size however did not fit a Yamaha 200 HP outboard as it said it was suppose to.
Knowing that props really need to be torqued for proper installation I would consider this tool an "emergency kit" necessity not my main tool to replace my prop! Tony