Bostitch STCR50193/8-5M 3/8-in Long Heavy-Duty PowerCrown Staples (5,000 pk) PFR Env Fits PC1000, PC2000, PC4000, PC4000OC1, PC5000, H30-8D6, P6C-8, and USO56-1 This fastener can only fit in Bostitch tools