Nailer feeder spring numbered 877761, works on coil roofing nailer, 20 items in package. Work to replace the broken or worn-out springs, adjust the flexibility of the roofing nailer, provide efficient work. Fits for Coil Nailers NV45AA, NV45AB, NV45AB2, NV45AB2S, NV45AE, NV45AA, NV45AB, NV45AB2, NV45AB2S, NV45AE. Made of high quality metal, use durable and anti-corrosion materials to ensure longer service time.