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The 463 series is a 0–½″ (0–13 mm) mechanical micrometer head.
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It comes in different variants / configurations: plain, with ratchet stop, lock nut, carbide face, etc.
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The finish is typically satin chrome, which helps with readability and resists glare / rust.
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The spindle is “one-piece” hardened, for stability / durability.
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There’s a ring-type lock nut on some versions so you can lock the setting.
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