The Bison-Bial reducing sleeve adapts an MK4 Morse taper socket to an MK2 internal taper. It has ground internal and external tapers and is hardened throughout. It is designed for tools with a Morse taper and tang; an ejector wedge is used to remove them from the socket.
- Type: Morse taper reducing sleeve
- Socket: MK4
- Internal taper: MK2
- Finish: Hardened throughout
- Length: 124 mm
- Compatibility: Tools with a Morse taper and tang