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Corrosion resistance and long lasting performance due to the EnviroSeal blue coating. Deep threads provide superior holding strength. Great for anchoring items to concrete, brick, block, or other masonry materials. The diamond tip allows for superior penetrating into hard materials. Ideal for solid concrete, brick, block or mortar joints. Length is measured from under the head. 3/16” requires a 1/4” driver. 1/4” requires a 5/16” driver. 5/32” hole for the 3/16” diameter. 3/16” hole for the 1/4” diameter. Building code approved – MIAMI-Dade County. Taps threads in to base material. ACQ treated lumber rated. Fast and easy to use.