HiKOKI 886311 M4x12 Seal Lock Hex Socket Head Bolt for compatible Hitachi and HiKOKI cordless and gas nailers. This replacement fixing is used to securely fasten components within the blade guide and locking assemblies, with the seal-lock design helping resist loosening during repeated firing and vibration. Suitable for replacing a worn, damaged or missing original bolt and manufactured to the correct specifications for precise fit and secure fastening.