All I can say is WOW! This this is freaking incredible! I work in a heavy truck shop in farm country, frequently we see rusty nuts that will not budge with our biggest tools, it's common that we have to heat or cut nuts off, this tool effortlessly broke a nut free that has been out in the elements for 20 years, INCREDIBLE! I would never have believed it if I hadn't done it myself.Fair warning, the crappy thing is the cheap chinese grease that is inside it is just brushed on the planetaries, that is not going to cut it. Take the snap ring loose, hammer lightly on the reduction side to pop the cover off the input side and pump each planetary level plumb full with the grease gun and reassemble the multiplier, DO NOT USE IT UNTIL YOU GREASE IT!