Nuts and bolts are often used together to refer to the basic elements or practical aspects of something. The antonyms for "nuts bolts" can vary depending on the context in which they are used. One possibility is "abstract concepts," which would refer to more theoretical or intangible ideas. Another antonym could be "advanced technology," as nuts and bolts are associated with more traditional or basic mechanics. Alternatively, "complex structure" could be an antonym, as nuts and bolts are often used to describe simple or straightforward systems. It is important to consider the specific context in which the phrase is used when seeking antonyms.