The Makita 233940-9 is a genuine 19mm ring spring designed for use with a variety of Makita SDS+ rotary hammer drills. This durable, C-shaped retaining ring ensures secure assembly of internal components, preventing dislodgement during operation. It is compatible with models such as the HR2450, HR2470, DHR202, BHR202, and several others. Ideal for replacing lost or damaged parts, the 233940-9 maintains the integrity and performance of your tool.