... Core Bits: PQ, PQ3, PWF-Long, PWF-Short6. S- Gauge Core Bits: SWF-Long, SWF-Short7. U- Gauge Core Bits: UWF-Long, UWF-Short8. Z- Gauge Core Bits ... B86, B101, B116, B131, B14613. Chinese Standard Metric Core Bits for Single Tube Core Barrels: φ36, φ46, φ56, φ59, φ ... Standard Metric Core Bits for Double Tube Core Barrels: φ56, φ59, φ75, φ9115. Chinese Standard Metric Core Bits for Wireline Core Barrels: φ ...