2PCS SPRING CROWFOOT WRENCH SET Just one tool needed for adjusting tie tods for most car brands and models. Simply attach to any 1/2" or 3/8" ratchet or breaker bar and it is ready for use. With a 8-17mm range for the 3/8" and 14-32mm range for the 1/2" spring-loaded serrated jaws, each tool allows you to firmly hold and remove damaged fasteners. Made of chrome-vanadium alloy steel with black oxide and satin finish. Size: small jaw:8~17mm , big jaw:14~32mm