WHOLESALE Heat treated chrome vanadium steel.Black oxide finished for durability.Folds down for easy storage. Wrench sizes: 1/4, 7/32, 3/16, 5/32, 9/64, 1/8, 7/64, 3/32, 5/64.Illinois Industrial Tools ⚠ WARNING: This product can expose you to DEHP, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.