Boring cutter cutting knife holder, the product is car clamp groove blessing tool rod thickness range is less than 1/2-1, groove depth is 3/4 of less than, cutter holder is dovetail to positioning, the position of the adjusting nut side can quickly adjust the knife clip location, four compression screw blessing repositioning precision lathe tool bar high guarantee within 0.02 MM, groove and dovetail vertical degree good, high efficiency, which is convenient to use.