Powers Fastening Innovations 7414SD1 Power-Stud and Sd2 3/8-Inch by 3-1/2-Inch Type Carbon Steel Wedge Expansion Anchor Stainless 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