Model Number: 877-330. Top Cover Dimension: 3.2inch *2.43 inch. 877-330 Top Cover for Hitachi NR83A, NR83A2, NR83A5, NR83AA, NV65AC, NR83AA2, NR83AA3, NR83AA5, NV83A, NV83AA, NV83A2, NV83A3, NV83A5. Compatible With: NR83AA3 Clipped Head Framing Nailer, NV65AC Coil Pallet Nailer, NV83A2 Full Round Head Coil Nailer, NR83A2 Full Head Framing Nailer, NR83A2(S) Framing Nailer, Full Head, Plastic Strip Collation (without Depth Adjustment), 83AA2 Strip Nailer, NR83A 3-1/4" Full Head Nailer, NR83AA 3-1/4" Clipped Head Framing Nailer, NR83AA2 3-1/4" Clipped Head Framing Nailer, NV65AA Nailer, NV75A Nailer, NV83A 3-1/4" Full Head, Framing Coil Nailer. These parts install quickly to make your nailer work like new again. A brand-new, unused, unopened, undamaged item in its original packaging.