The draper 21 piece impact rated nut and bolt extractor socket set is a screw extractor set designed for removing stripped, rusted or frozen fasteners. This extraction socket set is built for damaged bolts, nuts and screws that standard sockets can no longer grip. It suits mechanics, maintenance engineers and diyers who regularly meet seized or rounded fasteners. The sockets are made from chrome molybdenum steel and are impact rated. Their slim design helps with access to fasteners in restricted spaces. The set is supplied in a sturdy plastic storage case, which keeps all 21 pieces organised and easy to transport. Features and benefits: extracts stripped, rusted or frozen bolts, nuts and screws impact rated for demanding extraction work chrome molybdenum steel construction slim design for easier access sturdy plastic storage case included specifications: number of pieces: 21 material: chrome molybdenum steel