Concrete Screws
Introduced as Tapcons in the 1970s, and now available under a variety of trade names, these screws are popular among contractors because they are versatile and easy to install. Concrete screws are driven into slightly undersize holes, producing a snug friction fit. They work well in concrete, block and brick. Screws are available in diameters of 1/4 and 3/16 in., with hex and Phillips heads; they also come in stainless steel and coated carbon steel, so you can use them outside. Concrete screws, which are removable, will handle heavier working loads than many plastic and lead anchors. They require specially sized bits, usually sold with the fasteners.
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