INROCK^®'s Interchangeable cutter (MT/TCI) BMR - Boremaster reaming product line further underscores our long term, focused commitment to increasing HDD drilling tool performance BMR provides proven drilling performance cutting pass of 6" -10" (.15 -.25 m), LOWEST COST PER FOOT, in soft - medium rock (1000 psi - 12,000 psi). This cost effective, flexible plate form compliments INROCK^®'s high performance XTR® and premium hard rock HDX® reaming product lines.