Psycho Driller is one of the four skins released under the Rise of the Mechanos part of the Mechanos offer. It was available for individual purchase in late June 2017.
Psycho Driller could be purchased in the Skins Shop under the ‘Mechanos’ tab for 3320 coins. It may not be available for purchase in the future.
Details of this offer may vary depending on location and platform.