Heavy duty thrust bearing won't damage new threads. Fits truck studs up to 22mm or 7/8. Installs truck studs in seconds. Use with an impact wrench or ratchet. Easily pulls the stud into position This tool installs most truck wheel studs in seconds. Use with an impact wrench or ratchet. The tool body is equipped with a heavy duty thrust bearing to easily pull the new wheel stud into place. Fits truck wheel studs up to 22 mm (7/8) in diameter. Use the lug nut to tighten against the tool body to pull the stud in position.