This is also known as “Ring Drilling Machine” and “Long Hole Drilling Machine". It is the most versatile percussion drill machine for tunneling, drilling, long hole drilling, and cable bolting holes for roof support. Rama Mining Tools is a leading manufacturer, exporter, and supplier of Simba Junior. A ring drilling machine is specially designed to drill holes in 360-degree rotation f... https://www.youtube.com/watch?v=yJgiugnY63c&ab_channel=RamaMiningTools