The phrase "concrete details" refers to specific information or facts about something that is clear and can be easily seen or understood. Full definition
I immediately noticed that there was a surprising lack of concrete detail about the quality of the console ports available online. (alternativemagazineonline.co.uk)
With the release just a few short months away more concrete details on content and gameplay will likely be released rapidly - so get ready. (screenrant.com)
Its activities were first seen as far back as 2004, but recent developments have revealed more concrete details about the operation itself, including its origins and targets. (trendmicro.com)