Impact Tough, 3.5", Square #1, Power Bit, 10x Life Over Standard Impact Bits, X-Tended Torsion Zone Helps To Absorb High Torque Of New Impact Drivers, Precision Engineered Tips For A Tighter Fit & Less Cam Out, Heat Treated Manufacturing For Stronger Bit, High Visibility Sleeve With Laser Etched Markings For User Convenience.