Titan Tools 16057 7-Piece Disposable Damaged Bolt Extractor Ring Set is perfect for removing severely damaged bolts that are up to 80% stripped. Sizes included are 8, 9, 10, 11, 12, 13, and 14mm (also fits 5/16, 7/16, and 9/16-Inch). Sockets for stripped bolts form to damaged hardware for easy removal of damaged hardware. Use bolt extractor rings with a 12-point wrench or socket that is 2mm greater than the bolt size. Bolt extractor sockets are reusable – simply remove by hand or with a punch, if necessary. Damaged bolt extractors are constructed of alloy steel with a black manganese phosphate finish. Made in Taiwan.