Steer well clear of the TIR racing screw kits, they may look nice, but the hex's do not go down to the bottom of the hole, this means that if you do not have your driver in absolutly straight your round out the head!!!!

They are useless, and Ive just bought a couple of sets of 3 racing screw kits (cyclone Kits, but all the screws are right for the 415) nad they are ace!!!