... Tricone Drill Bits 1-API or ISO 9001:2008 2-Delivery Date: In 7 days 3-Delivery term: By ... sandstone and other formations with intermittent hard streaks. 3,Medium to hard formations(213,214,215,217)These ... requirements Payment Term T/T or L/C at sight MOQ 1 Piece Supply Ability 1000 Pieces/month ... work days SizeBit TypeIn.mm6152.4517G, 537G, 617G, 637G6 1/2165.1517G, 537G7 7/8200.0517G, 527G, 547G, ...