HiKOKI 949451 M3 Spring Washers supplied as a pack of 10 for a wide range of compatible Hitachi and HiKOKI power tools. These replacement lock washers fit with the relevant M3 fasteners and provide spring tension to help resist loosening caused by vibration during operation. Suitable for replacing worn, damaged or missing original washers and manufactured to the correct specifications for precise fit and secure fastening.