Engineered performance. Stainless steel. Patented design requires no pre-drilling; Use for decking and all exterior wood projects. No strip T-25 star drive; Countersinking blades; No split twist shank. No pre-drill bore-fast thread. Limited lifetime guarantee. Limited lifetime guarantee against rust and corrosion. See hillmangroup.com for product warranty information and performance data. www.hillmangroup.com. See www.hillmangroup.com for product information. For information product patents visit www.hillmangroup.com. Made in Taiwan.