Original Makita 643890-4 — safety/key interlock used to enable and disable several Makita battery outdoor tools. This small, purpose-made replacement key restores the mower/vehicle’s safety circuit so the machine will run again; it’s supplied as the original Makita part and installs in the keyed slot on the control / battery cover.
Example fits (for reference): DLM380 (380 mm cordless lawn mower), DLM431 (430 mm), DLM432 (430 mm) — and Makita power‑assisted wheelbarrow DCU180. Keep one of these genuine Makita keys on hand to get a lawn mower or utility unit back to work quickly; it’s a simple, direct replacement sold as the Makita 643890-4.
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