Professional extractor set for commercial or occasional use Bolt extractor set Twist extractors to remove broken studs, pipes, set screws, grease fittings etc Useful for trying to free rounded off rusted, tight or painted over bolts Special reverse left handed threaded sockets This precision kit allows you to extract hexagonal bolts which are corroded or seized and need to be removed without damaging the casing or thread Manufactured from chrome hardened steel for maximum durability Will easily bite into and grip the softer bolts Metric and imperial size bolt extractors Spiral cut teeth provide a positive grip to remove rounded or damaged bolts Can be used 3 ways by a ratchet (3/8" drive) / spanner on the flats on the side of the bolt extractor, or by any type of drill (electric / battery or air) as comes complete with drill power bit adaptor. Can be used with a ratchet or metric spanner SET INCLUDES THE FOLLOWING • 1 x bolt extractor 6mm / 1/4" - 3/8" Drive • 1 x bolt extractor 8mm / 5/16" - 3/8" Drive • 1 x bolt extractor 9.5mm / 3/8" - 3/8" Drive • 1 x bolt extractor 11mm / 7/16" - 3/8" Drive • 1 x bolt extractor 12.7mm / 1/2" - 3/8" Drive • 1 x drill bit adaptor Comes in a blow molded case for easy storage and transportation