The special internal thread designs are engineered to easily extracts damaged bolts , lug nut and screws appliance , vehicle repair and industrial instrument Crafted from high strength steel with a resistant coating , ensuring durability and long lasting use It will easily extracts damaged bolts , nut , and screws even if they are stripped , rusted , or frozens The lug and nut disassembly tool with reverse spirals designs can be bitten downwards to provide clamping force The more it rotates , the tighter the socket is clamped This bolt extractor set includes sockets in the most commonly needed sizes , all clearly marked on each socket ： 13mm , 9 / 16 " ( 14mm ) , 5 / 8 " ( 16mm ) , 17mm , 11 / 16 " ( 17.5mm ) , 3 / 4 " ( 19mm ) , 1 / 4 " ( 6.35mm ) , 5 / 16 " ( 8mm ) , 3 / 8 " ( 9.5mm ) , 10mm , 7 / 16 " ( 11mm ) , 12mm , 1 / 2 " ( 12.7mm ) , and adapter 1 / 4 ” To 3 / 8, Manufacturer: Watreketal