Powers' Tapper+ 3/16" X 3-3/4" Concrete Phillips Flat Head Screw Anchors (100/BX) (2750SD) are for light to medium duty applications in concrete, masonry block, brick, and wood base materials. They are fast and easy to install and provide a neat, finished appearance. Theses Tapper+ screw anchors are engineered with matched tolerance drill bits and the installation tools are designed to meet the needs of the user. The Tapper+ features a gimlet point for self-drilling into wood base materials without pre-drilling.