Lisle 61980 Strip Screw Extract, 10 Piece Ten sizes of extractors fit Torx and Torx Plus sizes T-10 to T-55; internal hex sizes 7/64" to 3/8" and 3mm to 10mm Will also work on other internal drive screw heads. To remove broken bolts, drill a pilot hole for the appropriate size extractor Choose the extractor that fits snugly in the fastener Turn counter-clockwise to remove fastener It may be necessary in some applications to drive the extractor into the fastener with a hammer for maximum torque