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High strength 1 inch - 24 inch Chevron drag bits / Oilfield Drill Bits Most common area of use are, in a lot of rock or tougher gravel & shale drilling. Also used in the oilfield for various drilling applications. Mash Chevron Bits design features include: a solid one piece heat treated, 4140 alloy steel body for bit strength & durability hardness rated 28-32 Rockwell 3/16 Tungsten carbide profile cutting edges Ultra high strength brazing to ensure bit toughness CNC threaded