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New design PDC bits, good performance 4.1/2", 4.3/4", 5.1/8", 5.5/8", 5.7/8", 6.1/4", 6.3/4", 6.5/8" 7.3/8" etc. PCD bits are avaiable. Our current product list as below: 1. Impregnated diamond core bits 2. Surface set Diamond Bits(coring bits and non-coring bits) 3. Casing(Rod) shoes/Casing bits 4. Reaming shells 5. PDC bits (coring or non-coring) 6. Core lifters, core lifter cases 7. Diamond circle wrench 8. Core barrel and accessories, BQ, NQ, HQ and PQ(Inner & Outer Tube, Head assembly, Locking Coupling, Adaptor Coupling, Inner Tube Stabilizer Ring, Landing Ring, Landing Shoulder etc) 9. NQ&HQ overshot. 10. BQ, NQ, HQ, PQ, NT, HT, PT drill rods and BW, NW, HW, PW casing. 11. Drag bits and tricone bits. * Above bits and reaming shells conform to Metric, DCDMA, CDDA standards. * We can manufacture all kinds of bits and shells according to customer's special requirement. Any requirement please contact us, we'll do the best service for you. Hope we can establish a good business relationship.