This is the TurnMaster Tip Holder.
About the TurnMaster:
The Robert Sorby TurnMaster is the first tool in the world to combine three cutting edge technologies in one flexible tool. Cutters are available in tungsten carbide, titanium nitride (TiN) and high speed steel (HSS) providing unsurpassed range to woodturners at every level. An unprecedented collection of parts and cutters make it the most versatile and value added single tool concept on the market today. Among its many features TurnMaster incorporates a patented interchangeable cutter head that locks into three positions allowing for simple scraping and shear scraping options.