Holder is a solidly built lead guard who has the the ability to get his own shot, as well as create for others.
"Tra is a wonderful young man and leader," said Silver. "He is great with the ball and makes very good decisions.
"Coach (Herb) Sendek is a tremendous man and he and coach (Stan) Johnson did a great job recruiting Tra."
Holder had offers from Florida State, Loyola Marymount and UC Santa Barbara, among others.
* Greg Hicks and Josh Gershon contributed to this report.