Aftermarket Piston Bumper 884-959 Fit Hitachi NR90AE, NR90AD, NV90AG & NR90AE(S) Nailers 888-100This part is compatible with the following machines:NR90AE 3-1/2" Round Head Framing NailerNR90AD Strip NailerNR90ADPR Strip NailerNR90AE(S) Strip NailerNR90AF Strip NailerNV90AGItem Weight: 4.8 ouncesPackage Dimensions: 5.24 x 3.78 x 1.3 inches