GuardDog is a versatile exterior wood screw used for a variety of applications including pressure treated decking, railings, deck framing and more. The TORX ttap Drive System delivers stick fit, wobble free installation. GuardDog features copper-rite protection, Fully tested, fully guaranteed in ACQ, Cedar, Redwood, and chemically treated lumber.GuardDog features a Type 17 point that quickly penetrates lumber, and it colored to matched to blend in with pressure treated decking.Includes 75, 3 inch exterior wood screws, and 1 TORX ttap #25 bit.In 2004, GuardDog because the first exterior wood screw specifically designed for the corrosive nature of chemically treated wood.