Compatible with for Power Tool Models NV45AB2, NV45AB2(S), NV45AE, NV50A1, NV50AP2, NV45AA, NV45AB (NOT Included) Material: Made of high quality metal, use and anti- materials to longer service time. Function: Work to replace the broken or worn-out springs, adjust the flexibility of the roofing nailer, provide efficient work. Features: Our feeder spring is produced using advanced CNC technology, ensuring accurate and consistent results. Every detail is to meet the highest standards of quality and performance, delivering a reliable and efficient feeding mechanism for your product. Color:Silver Black Material:Metal Package Contents: 10 * 877-761 prings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.