This extractor tool is adjustable to fit studs that are 6mm to 13mm This extractor tool is easy to operate and can help you get more rest-time, whether it is the exhaust-manifold, fuelplug, bolts, or, painted, rusted fastening screws The posts are effectively removed Great workmanship, with strict control and, high safety-factor, can be used with peace of mind Manufactured with a steel and will remove and damaged threaded studs fast extractor tool uses 3 / 8 inch-drive, best used with wrench and ratchet Also compatible with with flat wrenches, adjustable wrenches, sockets, and locking pliers, Manufacturer: YROHGKPN