... , B76, B86, B101, B116, B131, B14613. Chinese Standard Metric Core Bits for Single Tube Core Barrels: φ36, φ46, φ56, φ59, φ75, ... φ110, φ130, φ160, φ170, φ219, φ27514. Chinese Standard Metric Core Bits for Double Tube Core Barrels: φ56, φ59, φ75, φ9115. Chinese Standard ... Metric Core Bits for Wireline Core Barrels: φ59, φ75, φ91We can manufacture all kinds ...