PRL Crawler Mounted Drill Rig Model PBHD-50 is primarily designed for Blast Hole applications. PRL PBHD-50 is among the best and most sought after Crawler mounted drilling rig in the market. It is intended for use in blast hole drilling for mining purpose. PRL PBHD-50 is designed for 250mm (10″) diameter holes with a down the hole hammer. CRAWLER MOUNTED BLAST HOLE DRILLING RIG: <a href="https://youtu.be/nuKh6kszkeI">https://youtu.be/nuKh6kszkeI</a> CRAWLER MOUNTED BLAST HOLE DRILLING RIG (PBHD): <a href="https://youtu.be/OUFq59AxQqM">https://youtu.be/OUFq59AxQqM</a>