Built with plywood Precision saw cuts for tightest fit to quarter round and square walls Needlesharp, rustresistant nails spaced for handling and strong enough to withstand a full power stretch C Pin only for plywood, particle board or hardwood floors Ringshank nails polished for visibility and prestarted to assure a straight drive C Pin only for concrete floors prestarted with hardy tempered nails to penetrate without splitting concrete and to ensure a solid anchor