6 Pack 877-317 Cylinder Rings. Compatible with Hitachi Power Tool Models NR83AA3, NR90AD, NR90AE, NR90ADPR, NV65AC, NR90AE(S), NV83A2, NR90AF, NR83A2(S), NV83A23, 83AA2, NR83A3S, NR83A, NR83A3, NR83AA, NV90AG, NR83AA2, NR83AA4, NV65AA, NV83A3, NV75A, NR83A2. Material: Rubber. A brand-new, unused, unopened, undamaged item in its original packaging.