The Makita 957223109 Ring Gear is a genuine OEM replacement part designed for various Makita angle grinder models, including GA4030, GA4031, GA4530, GA4531, GA5030, GA5031, 9557NB, 9557PB, 9558NB, 9558PB, 9557HN, 9557HP, 9558HN, and 9558HP. This essential component ensures proper power transmission within the grinder's gear assembly, maintaining optimal performance and durability. Weighing approximately 0.036 kg, this high-quality ring gear is built to Makita's exacting standards for reliability and a precise fit.