2,500 Per BoxStainless Steel1/4 Crown18 Gauge1 1/2 LengthSame as Senco LThese staples work in the following toolsDuo-Fast KN-1848, KB-1836, BN1832, ST18, SureShot 1820,1832,1840,1848, DNS-1840BEA 90/25-552, 90/32-611, 90/40-621, 90/40-711Porter Cable NS100, NS150, NSS150, NS100A, NS150AFasco F20-40, F25A-90/40, F3C-90/40, F3-90/40, F20T-90-30CT, R3C 90-40Haubold PN6040HJamerco JTS061825, JTS061838A, JTS061838HPrebana 2F-ES-26SD, 2M-ES-40SStan-Tech SDS18-14-26, SDS18-LM 14-26Supco 90-40Atro 90/40Campbell Hausfeld SN258KMax TA238/18-6Hitachi N3