Extra stiff stock allows them to be driven through 2 thicknesses of hardboard siding without bending. Head drives flush. Double dipped in molten zinc. Recommended by hardboard siding producers. Spiral type provides added holding power. Head: 3/16".
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.