This tool is designed to remove and install wheel bearing locknuts on 4-wheel drive vehicles. It is a combination tool that fits both 4-slot (1/2 ton) and 6-slot (3/4 & 1 ton) 4WD front axles. It is designed for use with a 1/2" drive. The tool is made in the USA by Lisle Corporation in Clarinda, Iowa. It is not recommended for use with an impact wrench.