Hunan Fengsu‑Drill (fsdrill.com) is a Chinese manufacturer and supplier specializing in high-performance drill bits and related drilling equipment. With 15 years of experience, the company produces a variety of PDC (polycrystalline diamond compact) drill bits—such as multi‑wing, non‑coring, and hot‑press core bits—used in mining, geological exploration, water well drilling, grouting, ... https://fsdrill.com/product/5-wing-pdc-non-coring-drill-bit-deepwater-oil-drilling-in-granite-hard-rock-dolomite-heavy-duty-matrix-anti-wear/