The Makita 641850010 Ring With Keyway is a genuine OEM replacement part specifically designed for various Makita angle grinder models. This essential component plays a crucial role in the secure fastening of internal parts within the tool's assembly, contributing to its overall stability and safe operation. Manufactured to Makita's rigorous quality standards, this ring with keyway provides a precise fit and reliable performance, ensuring the longevity and efficiency of your power tool. It is compatible with a wide range of Makita angle grinders, including GA4030, GA4530, GA5030, 9557HN, 9557NB, 9557PB, 9558HN, 9558NB, and 9558PB series.