Tapcon 28555 3/16x1-3/4 Blue Star Drive Bugle Head Concrete Anchors 225/Box As the original concrete screw anchor that revolutionized the construction world, Tapcon brand concrete anchors deliver the ease of use, superior precision and the unparalleled performance that professionals demand. With a new star recess to eliminate bit slip, Tapcon drives with ease and the patented thread design allows for quick and successful installation no matter the type masonry substrate anchored into. Use Tapcon concrete screw anchors for wood framing to concrete, electrical equipment, furring strips and many other applications that require fastening into brick, block or concrete. Features Eliminates bit slip with star recess Works in all masonry-based material including concrete, block or brick Use these screws for a variety of projects including fixing sill plates, electrical equipment, 2 ft. x 4 ft. and many other fixtures to masonry Climaseal blue coating delivers long-lasting corrosion protection. Chisel edges accurately cut threads into concrete allowing for consistent driving performance and back holding power. Replaces Tapcon 24555 USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.