BOLT EXTRACTORS: Extraction bits easily remove broken screws, studs, bolts and other fittings effectively. Stripped bolt remover and extractor works on seized bolts, broken fasteners, and commonly called an easy out.<br> LEFT HANDED DRILL BIT: Left-hand drill bits are made from cobalt fortified high speed steel for increased durability and service life. Reversed drill bit are used for removing broken bolts or studs turning left to prevent further tightening of the bolt or screw.<br> SPIRAL FLUTES: Unscrew tool with spiral flute bit dig into the screw, increasing grip as torque is applied for removal of screws, fasteners and bolts. Strip screw extractor kit gets those stubborn fasteners out.<br> METAL CARRYING CASE: Stored in a durable metal index carrying case for easy organization and storage with all sizes that are clearly labeled. Carrying size for when WD40 or easy out lubricant doesnt get the job done.<br> INCLUDES: Sizes: Left hand bits / reversed drillbits - 5/64", 7/64", 5/32", 1/4", 19/64" and Matching Alloy Extractors (stud outs) - #1, #2, #3, #4, #5 in a red carrying case..Items from Sheng Xinshun's shop