Dewalt DT7508QZ 1/4" Hex to 1/2" Square Impact Wrench Adapter Features: Hardened core for extra strength and durability Flexible Torsion Zone absorbs torque peaks and reduces breakage (Torsion bits only) "Extra Grip" ribs grip the screw and reduce slipping (specific bits only) Tough quality, professional screwdriver bits including Torsion and Torsion with "Extra Grip" ribs