Heavy-duty square shank for wrench-assisted turning; bolster reinforces shank for hard use; designed for the most demanding uses; cushion-grip handle for greater torque and comfort; premium chrome-plated for smooth feel and corrosion resistance; internal flanges inside handle provide solid, twist-resistant blade anchor; precision-machined tip for exact fit; special heat-treated shafts; meets or exceeds applicable ASME/ANSI specifications; patented "Tip-Ident" quickly identifies the screwdriver type and tip orientation.