✅ Japanese Carbide Blade SKH-9 | Heat Treated to Rockwell C Hardness 64-66 ✅ Typically used in making professional grade dies, taps, punches and tooling | In field tests it lasts significantly longer than the US S7 Steel ✅ Aerospace grade #2024 Aluminum piston | Mechanically locked piston driver interface ✅ Compatible with BT1855 Oil-Free Brad Nailer | BT1855K (Type 0) 18 Gauge Brad Nailer | BTFP12233 (Type 1) Smart Point 18 GA Brad Nailer Kit