This is a SAE Standard nut driver wrench set from MIP. For more than 30 years, MIP tools have ruled RC pit tables. Chosen by World Champions and hobbyists alike for their superior build quality, tool longevity, and all-American construction. With a new year comes a new era for MIP's tool line that, frankly put, just makes sense. MIP's all new nut drivers feature an all-steel construction that is nickel plated to perfection, the nickel plate process boosts the steel hardness level to that of your automotive grade tools; a whopping 70+ on the Rockwell scale! On the surface, you will notice these nut drivers are stubbier than traditional drivers, this characteristic allows for a better overall weight balance and reduces tool box space. At a glance you will be able to know exactly what size nut driver you are grabbing as each one has a special color-coded ring and etched sizing on the shank. The drivers also feature a slim hex wall and deep bore to ensure that you are able to get into the tightest of places and not worry about bottoming out on anything in the process!