Original Makita 125420-8 — Tool Holder Assembly (quick‑change SDS‑Plus chuck) designed to replace the worn or damaged chuck / sleeve on Makita rotary hammers. This genuine Makita tool holder accepts SDS‑Plus bits (SDS‑Plus shank ≈ 10 mm) and installs as the complete chuck assembly used on the HR3210FCT model. The part is listed in Makita’s parts breakdown and is listed as "Tool Holder Ass'y (quick change SDS‑Plus chuck)." Makita spare parts are numbered so you can match 125420-8 directly to the HR3210FCT exploded diagram when ordering a replacement.
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