Square Recess (also known as Robertson®) screwdriver bits are very popular. The head has a slight taper which prevents cam-out and holds the screw more securely.

Sutton Tools Supabit Extreme Impact Bits – Certified ‘heavy hitters’ specifically developed for use with the high-torque output of an impact driver.

• Square Recess tip: slight taper prevents cam-out and holds the screw more securely
• Magnetic tip increases productivity and eliminates frustration when working at awkward angles or in tight spaces
• 3X torque: Torque tested to exceed DIN standards by up to 330%
• 1/4" hex shank with power groove for use in impact drivers and quick change adapters. 1/4" hex insert with retaining notch for use in bit holders and hand drivers
• Cold forged from premium shock-resisting S2 tool steel with a hardness of 58-62HRC for superior strength
• Manganese Phosphate coating for highest hardness and superior corrosion and wear resistance.