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BX' type corebit. 2.365 ins. diam. 2 3/4' long. This diamond tipped drill bit is used for taking core samples when Science Museum Group © The Board of Trustees of the Science Museum
"BX" type corebit. 2.365 ins. diam. 2 3/4" long. This diamond tipped drill bit is used for taking core samples when drilling for oil or gas. Materials of construction are: mild steel, tungsten powder, brass infiltrant, diamonds.