1875 count, multi-pack t50 staples, 625 each of the 3 most popular sizes of t50 staples, 1/4", 3/8" & 1/2" heavy duty staples, within a reusable re-closable clamshell package. narrow crown, fits master mechanic: m5100, m5000, m5500; arrow: t50, t50x, t50hs, ht50, ht55bl, all other t50-series staplers.