Power-Stud®+ SD4 Stainless Steel Wedge Expansion Anchors Print The Power-Stud+ SD4 and Power-Stud+ SD6 anchors are fully threaded, torque-controlled,stainless steel wedge expansion anchors which are designed for consistent performance in cracked and uncracked concrete. Suitable base materials include normal-weight, lightweight concrete, and grouted concrete masonry (CMU). The anchor is manufactured with a stainless steel body and expansion clip. Nuts and washers are included. Read Less