X-Acto - Needle File Set - X-Acto Needle File Set is a precision tool from X-Acto. Great for fine detail shaping and smoothing of models, miniatures and jewelry. Can be used with wood, palstic, or metal. Includes the following six files: 1 round, knife, equaling, square, No. 3 square, and 1/2 round, plus a quick change handle.