Flexible Drilling Angles for Slopes and Uneven Terrain Built for multi-angle drilling, this fully pneumatic crawler drill rig features a highly adjustable boom and sliding frame. The sliding frame swings 47° to the left and 54° to the right, while the drill boom tilts 46° upward and 23° downward. The boom can also swing 40° to either side, allowing operators to align the drilling tool with different working surfaces. This flexibility makes the rig suitable for slope drilling,