... API&ISO9001:2008 New PDC Bits(12-1/4") Description about sell rock bits,tricone bits, ... tooth bits, rock bits, oilfield bits and so on .Specification: diameter from 5-1/8” to 13 ... field, construction, geothermal, directional boring, and underground foundation work Formation sticky, soft, medium hard, hard formation Bearing ... Pieces/month Delivery Time within 7 work days 8 1/2" (215.9 mm) New PDC Bits