HiKOKI 372737 Wheel Washer for compatible Hitachi and HiKOKI 100mm angle grinders. This replacement washer fits onto the grinder spindle beneath the grinding disc, helping correctly locate and support the wheel so it can be securely clamped by the wheel nut. Suitable for replacing a worn, damaged or missing original wheel washer and manufactured to the correct specifications for precise fit and secure disc installation.