bit gauge

bit gauge, bit stop

A metal piece temporarily fixed to a bit to prevent drilling too deeply in a blind hole.
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Tenders are invited for Supply of Bit breaker, bit gauge and mud bucket
Bruno Cuillier, Product Manager for Varel Eastern Hemisphere Operations, observes, "Over the course of several months Varel lab tested more than 70 gauge configurations to ultimately derive three specific bit gauge configurations and build a gauge behavior numerical model for use with these new products.