Model Number Outer Dia.(A)mm Inner Dia.(B)mm The Max Wall Thickness Reamed Dia.(C)mm Eccentric140-HD45-115 168 156 6 185 Inner Dia. of Casing Shoe(D) mm Inner Dia. Of casing shoe that pilot bit can pass through Type of Hammer Recommended Hammer Type(E) Drill Pipe mm 142 140 DHD350 DHD350R,QL50 HD55 76/89