It's imperative to have clean and straight threads to achieve proper torque when rebuilding an engine. All sizes in the set are stamped for easy identification. Both six-piece sets are packed in a plastic pouch that includes: 1/4", 5/16", 3/8", 7/16", 1/2" and 9/16".
WARNING: This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.