Diamond crown drill bit for drilling reinforced concrete and brick on a diamond drilling machine, water-fed. The ring segment is silver-brazed to the steel core and can be retipped at a specialist service centre once it wears down. Slow the rotation speed through rebar. 1/2 in GAS shank. Diameters span 12 mm to 35 mm. ADTnS DDR-B RM4, an ADTnS line made by the Distar group.
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