10 x 3 in. Engineered performance. No pre-drilling (Concrete and masonry applications require a pre-drilled hole that is 1/4 in longer than screw length (see drill bit chart). In metal up to 20 gauge thick, no pre-drilling is required). Premium exterior coating. T25 Pro-Stik included. Wood. Masonry. Metal. Drywall. Plastic. Engineered for optimum performance in multiple materials, Power Pro One Screws are the one screw you'll ever need! Flat Head - Easy & clean countersinking in wood. Star Drive - Star Drive and Pro-Stik bit prevent cam-out and increase stability while driving. Spiral Flutes - Superior torsion & pull-out strength in wood and concrete. 1-1/2 in & longer screws have this feature. Serrated Hi-Lo Threads - Increase installation speed while reducing drive torque. Pyramid Point - 3 sided point drives fast through wood and acts like a drill when penetrating metal up to 20 gauge thick. Limited lifetime guarantee. www.hillmangroup.com. See www.Hillmangroup.com for product warranty information. Reusable. Reclosable. Stackable. Made in Taiwan.