8 x 1-5/8 Inches. T25 Star. Ideal for decking and exterior wood projects. No pre-drilling. Green color complements treated wood. Free bit! No strip star drive. Countersinking nibs. Serrated threads reduce drive torque. Fast start self drill point prevents splitting. Lifetime guarantee. Limited lifetime warranty against rust and corrosion. www.hillmangroup.com. See www.hillmangroup.com for product warranty information. Made in Taiwan.