Bostitch 1/4 In. x 7/16 In. heavy-duty PowerCrown staples use PowerCrown technology, which improves drivability and reduces buckling. The coated finish increases the withdrawal strength. These heavy-duty PowerCrown staples fit Bostitch tools: PC1000, PC2000, PC4000, PC4000C1, PC5000, H30-8, P6C-8, USO56-2.