The Torx Plus ® fastener and bit configuration gives a closer fit, 25% increased bit strength and up to 100% more drive cycles. Zephyr Torx Plus bits give you a precision fit, high quality steel alloys and our exclusive heat treat process. By design, Torx Plus head screws resist cam-out better than Phillips head or slot head screws. That means unsurpassed toughness, high torque transfer plus reduced slippage and cam-out. Where Phillips heads were designed to cause the driver to cam out, to prevent over tightening, Torx Plus heads were designed to prevent cam-out.