Snap-on's 13 pc Multispline Screw Extractor Set, No. REX13C, is made in the U.S. and is compatible with wrenches, ratchets, and pliers. The set's compact design is perfect for technicians working in tight spaces. The extractors are also made of alloy steel for durability and a long thread life, and the left-hand threads provide strong gripping power for removing damaged bolts, studs, and screws. Each extractor is also stamped for easy identification and stored in a 1/8-1/2" storage tray.