Designed for extracting TRX-Star* screw heads and fasteners that have become damaged, cross-threaded or jammed. Manufactured from strong S2 steel with chrome plating. Sizes E10 - E40 feature 1/4" chuck shanks enabling use with a cordless drill. Set includes a 1/2" x 10mm adaptor suitable for E45, E50 & E55 sizes. Supplied in storage case with EVA foam.