Drilling Rod: made by CNC, and multi-heat treat, with premium alloy steel BQ,NQ, ... )We produce a wide range of drilling tool including drill rod, wireline core barrel (AQ-PQ) and assemblies ... Core barrel: BQ NQ NQ2 NQ3 HQ HQ3 PQ PQ3 head assembly and parts3.AQ-PQ, BTW, NTW, HTW, ... shell & shoe bit (syntheyic and surface-set, PDC) 4.Drill tool: hoisting plug, water swivel, overshot, outer tube & inner ...