Milwaukee 48-96-0310 5/8-Inch by 18 Gauge 1/4-Inch Narrow Crown Galvanized Staple (5,000 per Box) 5,000 per box Fits Milwaukee 7155-21, Duo-Fast, Hitachi, Porter-Cable, RIDGID, Senco and most other 18 gauge 1/4" crown finish staplers.