The phrase "spec details" refers to specific details or specifications about something. It means getting into the specific and detailed information about a particular item or idea. Full definition
Even though the source is in possession of the prototype, they haven't shared specs details. (themrphone.com)
A guy in his 20s wants spec details and to see under the hood. (cnet.com)
While no official spec details are available at this point, various leaks and rumors have tried to paint a picture of what to expect from the next flagship phone. (techtimes.com)