Invention on Instagram: "Jackleg drilling is a core technique in underground hard rock mining, used to create the holes needed for installing rock bolts that keep the roof and walls stable. A jackleg drill is a pneumatic rock drill with an extendable leg that braces the tool against the ground or wall, allowing the operator to push the bit firmly into the rock. This setup gives miners the leverage needed to drill accurate holes at different angles, even in narrow or uneven headings. The air powe