Dewalt dt torsion bits extra grip pz2 pz3 ph2 ph3 2550mm packs of 520 dewalt dt7238 qz this pack of 20 torsion bits from dewalt are a key addition to any tradesmans toolbox featuring tough quality professional screwdriver bits manufactured with a hardened core for extra strength and durability they have a flexible torsion zone absorbing torque peaks and reducing breakage the design features extra grip ribs that grip the screw and reduce slipping specific bits only dewalt dt723