Multidec Micro-Bore system makes locating micro boring bars in the holder simple and easy for quicker micro-boring bar changes. The uniquely designed boring bar incorporates an angled back that locates the bar less than 0.0004 in. against a positive location pin in the bar holder. By simply hand tightening, a fine pitch threaded knurled nut applies the force needed against the boring bar snap ring. No wrenches are needed, significantly limiting micro-boring bar breakage from slipping wrenches in tight tooling areas.