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Material: steel; Model: 1/4 ", 1/8", 5/16 ", 7/16", 9/16 " Thread removal range: 1/8 "~ 1/4" M3 ~ 6; 1/4 "~ 5/16" M6 ~ 8; 5/16 "~ 7/16" M8 ~ 11; 7/16 "~ 9/16" M11~14; 9/16 "~ 3/4" M14~18 Quality: carbon steel as a whole heat treatment, tough and durable Remove the broken screws, bolts and studs without damaging the bolts or holes. The extractor has round flutes and is made of tempered chrome molybdenum steel. is to remove the damaged screws; stripping screws; rusty screws; broken screws the best tool.