Anchor's 18 Gauge 1/4-Inch Narrow Crown Galvanized Staples are made of High Tensile Wire and come 5,000 per box. These staples fit the following tools: Spot nails WS4840, WS4840W2, FS4825, TS4825, Senco SLS20, SLS25XP, SKS-L, SKSN4450, KMN4450, LN4450, SLS18, FinishPro 2N1, Craftsman 18406 1/2-Inch-1-Inch, 183671/2-Inch-1-1/2-Inch, Duo-Fast KN1848A, KB1836, BN1832, DNS-1840, ST-18, Hitachi N3804AB, N3804A, Porter-Cable NS100 1/2-Inch-1-Inch, NS150 1/2-Inch-1-Inch, NSS150, NS100A, NS150A, Makita AT638, Jamerco JTS061825 1/2-Inch-1-Inch, JTS061838A 1/2-Inch-1-1/2-Inch and JTS061838H 1/2-Inch-1-Inch, Fasco F20T 90-30 CT, F20T 90-40 CT, R3C 90-40 CT, F20-40, F25A 90-40, F3C 90-40 LN, F21T 90-40A, and Max TA238/18-6.