Power-Stud®+ SD1 Wedge Expansion Anchor Print The Power-Stud+ SD1 anchor is a fully threaded, torque-controlled, wedge expansion anchor designed for consistent performance in cracked and uncracked concrete. Suitable base materials include normal-weight concrete, lightweight concrete, concrete-filled steel deck and grouted masonry. Anchors manufactured with a zinc plated carbon steel body, expansion clip, nut and washer. Read Less