... intermittent hard streaks. 3,Medium to hard formations(213,214,215,217)These bits are designed to drill ... formal outer thread(inch)Inchmm 3 1/25 7/8149.2GA2146 1/8155.6GA2148 1/2215.9GA114,GA 115,GA134, ... 5/8269.9GA114,GA12412304.8GA124,GA13412 1/4311.2GA114,GA115,GA124,GA214,GAT215G17 1/2444.5GA114,GA125,GA134,GA214, ... Term T/T or L/C at sight MOQ 1 Piece Supply Ability 1000 Pieces/month Delivery Time ...