Concrete Screw Bits are used to pre drill holes used for self tapping concrete anchors and are specifically designed for use with TAPCON ®™ concrete screw anchors. When using self tapping concrete anchors, such as TAPCON ®™ concrete screw anchors, pre drilling the right size hole is critical. Make the hole too large and the self tapping concrete anchor screw will fail to achieve maximum holding power and possibly fail to hold completely. A small hole will result in the self tapping screw anchor binding in the hole, twisting of the head, breaking or snapping off above or below the surface. Each bit is precisely sized to match the required tolerances necessary to achieve maximum holding power from self tapping concrete screws. Holes that are pre drilled using the properly chosen Tang will prevent physical damage to the anchor caused by the anchor bind in the hole. Constructed of hardened alloy steel with a close tolerance carbide tip, it is available in Tang style shank.