Air Locker 14 gauge x 5/8 inch length T nails are designed for wood to concrete or light gauge steel applications. This is an ideal way to have any size you need to match the job. Comes in a plastic box contains 1000 T Nails. T-Nails to accommodate many applications including nailing plywood to concrete, Light gauge steel drywall track to concrete, wire lath to masonry, steel banding to wood, wood to steel, decking, fencing, sub flooring general construction and much more.