HiKOKI 886331 Ratchet Spring for compatible Hitachi and HiKOKI cordless, gas and pneumatic nailers. This replacement spring forms part of the ratchet and adjustment mechanism, providing the tension required for correct movement and positioning of the associated adjuster and pushing-lever components. Suitable for replacing a worn, weakened, damaged or missing original spring and manufactured to the correct specifications for precise fit and reliable operation.