Powers Fastening Innovations 7423SD1 Power-Stud and Sd1 1/2-Inch by 4-1/2-Inch Type Carbon Steel Wedge Expansion Anchor Carbon Steel Clip, 50 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