Just got my MIP hex driver set and man, big difference. In case any ones still using cheaper drivers, you need these. They fit perfect, no slop at all. For screws into plastic, it's not that big a deal. But for screws into metal with loctite, they make the difference between removing the screw or stripping it out. A must have. Another must have is a shock tool. I changed out my plastic turnbuckle balls for the Hot Racing aluminum ones on my Senton, and the shock tool made it very easy with no damage to the ball ends. Very good purchase.