The DEWALT Torsion Phillips Bits with a hardened core for extra strength and durability. They have a flexible torsion zone that absorbs torque peaks and reduces breakage. The design inculdes etra grip ribs that grip the screw and reduce slipping (specific bits only).
These are tough quality, professional screwdriver bits.
DEWALT DT7233 Torsion Bits PH3 25mm Pack of 5