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. Special heat-treated shafts. Precision-machined tip for exact fit. Meets or exceeds applicable ASME / ANSI specifications. Tip-Ident quickly identifies the screwdriver type and tip orientation.