Casing pipes for jacking and drilling ROS-Z (RHDPEp) are smooth-walled pipes intended for directional drilling, joined by welding. As a standard, they are made in 6 and 12-meter sections, in black. ROS-Z (RHDPEp) casing pipes for jacking and drilling are smooth-walled pipes intended for directional drilling, joined by welding. As a standard, they are made in sections of 6 and 12 meters, in black.