Powers Fastening Innovations 7438SD1 Power-Stud and Sd1 5/8-Inch by 8-1/2-Inch Type Carbon Steel Wedge Expansion Anchor Carbon Steel Clip, 25 Per Box Fully threaded, torque-controlled, wedge expansion anchor Designed for consistent performance in cracked and untracked concrete Powers Fastening Innovations Manufactured with a zinc plated carbon steel body and expansion clip