SW KELLY BAR · SINCE 2004 Foundation Drilling Solutions by Formation The right Kelly Bar and tooling combination depends on your geology. Explore our recommendations for hard rock, weak rock and loose soil. APPLICATION Hard Rock (Granite) Interlocking / multi-locking Kelly Bar + roller-bit core barrel + rock auger. Learn More → APPLICATION Hard Rock (Granite) Interlocking / multi-locking Kelly Bar + roller-bit core barrel + rock auger. Learn More → APPLICATION Hard Rock (Granite) Interlocking / multi-locking Kelly Bar + roller-bit core barrel + rock auger. Learn More →