5-PIECE BOLT-GRIP EXPANSION SET
Use to remove rounded-off, rusted tight or -painted over bolts to break them freeReverse spiral flutes designed to bite down -to provide maximum gripping powerMade of high carbon steel for long lifeUniversal lobular design fits all fastener types3/8" square drive for use with ratchets, impactwrenches plus has hex flats for use with pliers