Setting Tools are designed for installing, or setting, machine screw anchors in masonry. The maximum allowable load for drywall (1/2") and plaster is based on a 2:1 safety factor using an average of ultimate tension and shear loads. The maximum allowable load for concrete (4,000 PSI), block (C-90), and brick is based on a 4:1 safety factor using an average of ultimate tension and shear loads.