The product is turning cutter holder, clamp groove blessing tool rod thickness range is within 3/16-1/2, groove depth is less than 29/64, cutter holder is dovetail to positioning, the position of the adjusting nut side can quickly adjust the knife clip location, four compression screw blessing tool rod high repeat positioning accuracy assurance within 0.02 MM, groove and dovetail vertical degree good, high efficiency, which is convenient to use.