The split drive anchor is a one-piece tamper-resistant, pre-expanded anchor. The anchor is designed for use in solid base material such as concrete. They are available in high strength, heat-treated alloy steel, zinc plated in either a flat or round head style. Split anchor, split drive anchors, flat head split anchor, round head split anchor, split bolt anchor, sup-r-split, spike, drive anchor, CSD, countersunk split drive anchor.Stanley Black and Decker (Powers Fastener)