Product Review

Bolt Extractor Sockets make it easy to remove rusted, rounded or damaged nuts and bolts
The working end has a helical shaped flute to help grip rounded fasteners, round head bolts and pan head screws.
Bolt Extractor Sockets can be used in combination with other drive tools
Through-hole design helps gain access to fasteners at the end of long bolts or studs
Can be used on SAE or metric fastener. 
Equipped to take on a larger range of bolts in engines, furnaces and appliances. Machined with precision from hardened steel, and built to last.
3/8" square drive for use with socket wrench or impact wrench
Reverse spiral flutes are designed to bite down to provide maximum gripping power
Universal lobular design fits all types of fasteners
Supplied in an organized case for tool storage