BlueSpot 25pc Stud & Bolt Extractor Remover Socket Kit Nut Set 4mm - 15mm The Blue Spot Tools 25 PCE Stud & Bolt Extractor Kit is a comprehensive set for the removal of broken bolts and studs. The kit comprises of a wide selection of HSS drill bits, extractor pins, drill guides and extractor sockets which aid in the removal of damaged and broken fasteners. The kit can be used on thread sizes from 4mm to 15mm. Manufactured from high speed steel for increased durability Comprehensive set for the removal of broken bolts and studs