Descriptions: This nut bolt extractor socket set is made of superior 40CR material, specially hardened sockets with corrosion protection are designed for the removal of damaged bolts, and nuts. It also includes a bar to help extract the damaged fastener from the socket. With this tool set, you will have experience in your repairing process. Features: This nut bolt extractor socket set is made of superior 40CR material, high hardness and durable in use. The specially hardened sockets with corrosion protection are designed for the removal of damaged bolts, and nuts. Spiral cut teeth provide positive grip, remove circular or damaged bolts. The innovative spiral digs itself into the head of a damaged screw or nut, allowing it to be easily loosened. It also includes a bar to help extract the damaged fastener from the socket. This too kit contains 10 pcs nut bolt extractor socket in different size, meet the need of your repair work under different situation. Specifications: Material: 40 CR(extractor socket), #45 steel(bar) Model: # 1 - # 10Explosion-proof: yesInsulation: yesMagnetic: noSize range: 9-19mm Bar length:10cm/3.94inch Bar diameter: 6mm/0.24inch Weight: 369g Remover NO. Fits hex size Outside hex size #1 9mm 16mm #2 10mm 16mm #3 11mm