These are Grip-Rite A11 3/8" staples, which are heavy-duty, high-performance fasteners specifically designed for use with hammer tackers like the Rapid R11 you previously cataloged.

• Design & Utility: The 3/8" leg length is a standard size for securing house wrap, insulation, and roofing paper. The "A11" designation refers to the specific wire gauge and crown width required to function correctly in high-impact hammer tackers.

• Bulk Configuration: You have a 5M (5,000 count) box, and with 20 boxes per case, this is a significant professional-level inventory quantity, totaling 100,000 staples per case. This is ideal for large-scale construction or renovation sites.

• Construction: Grip-Rite fasteners are known for their durability and consistent manufacturing, ensuring they feed smoothly through your hammer tacker without frequent jams.