For a very limited time until August 17, players will be able to purchase the Key Ring Bundle, a new promotional bundle available in the C-Store! This special bundle includes 20x Master Keys that can open any Lock Box, for the price of 2.250 Zen.
Every pack will also include a single Ultimate Tech Upgrade. Applying this item to any upgradeable piece of equipment will instantly set both its Mark and Quality to maximum (usually Mk XIV and Epic/Gold quality) with zero Dilithium Cost!
For additional information you can check out the Official Page.