The Mac Tools 7-pc 1/2" Drive R.B.R.T Metric Impact Foreign Object Removal Extractor Socket Set, No. SVMPEX7RBRT, features a bidirectional extraction design that allows for removal and re-insertion of damaged or destroyed fasteners. It can be used to remove rounded or destroyed bolts, nuts, screws, studs, and even pipes. The sockets are made from high-grade impact-rated steel and designed to be hammered on for superior grip. Sockets can be driven with a ratchet, wrench, impact, or pliers depending on the accessibility. The set includes a foreign object removal (FOR) pusher rod for easy removal of extracted material. Sizes range from 19mm to 25mm.