-Vorteck Impact screwdriver bits are designed to be tough, durable and the perfect fit. -Made from premium shock resistant steel alloy, expertly heat treated to give long lasting performance and wear resistance. -Specially engineered torsion zone gives up to 30 degrees of deformation resistance. -Magnetised tips help hold the screw in place while positioning. -Vorteck 1/4" Hex Quick-Lock Shank - Ensures a secure, slip-resistant connection for high torque applications. -Impact rated - compatible with battery impact drivers.