Fangrui Product Details 877-337 875-638 Suitable For Nr83a, Nr83a2, Nr83a2(s), Nr83a3 Frame Nailer Parts. The Sp-p1 Sp-p2 Plunger Valve And Trigger Valve Set Is Constructed From High-quality Galvanized Steel, Offering Excellent Wear Resistance, Resistance, And Moisture Protection. This Robust Construction Enhances Durability And Prolongs The Products Service Life. The Trigger Valve Assembly Drives The Piston Forward With Great Force, Enabling The Piston To Drive Nails Into Materials. The Plunger Valve Assembly Effectively Assists The Nail In Driving Large Heavy Nails Into Wood Or Other Materials, Completing The Task Efficiently. Colour:as Shown Material:metal Package Contents: 1x Sp-p1 Sp-p2 Kit 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.