English / Products / Metalworking Tools / Tooling Systems / BT / BT 40 Shank Tools / ER Single Angle Collet Chucks / ER Round-BT Form B/AD. BT40 Shank Tools. ER Single-Angle Collet Chucks Features and Benefits. Grip (2:1 advantage). Shank - Cylindrical Plain Shank - SK BT JIS B 6339
