Special zinc plated nails for very hard concrete.-High performance design for optimal penetration.-Stepshank design for optimal penetration.-22-27mm ETA approved for fastening on concrete. (Only valid with Trak-It C5)Applications:General heavy duty construction applications including:-Drywall steel track installation on to concrete, block or steel.-Plywood to concrete or block.-Furring strips to concrete or block.-Prefabricated materials.