An excellent medium duty anchor for attaching to concrete, brick or block base material. The design of the machine screw anchor allows it to fit into irregular holds. The machine screw anchor is described by the size of the internal threads, 1/4”, 3/8”, 1/2”, 5/8” and 3/4”. The internal threads of the machine screw anchors allow temporary fastening and rebolting with out affecting the holding values. The machine screw anchor is set using a setting tool.