Manufactured from chrome vanadium steel with a chrome satin finish body and highly polished heads. 15° open jaw angle to shank and ring end offset. Chrome plated finish to pevent from corosion. Ring head angle - 13° Conform to: 1/8" - 1/2" Whitworth - DIN 3113 & BS192:1982. 9/16" - 7/8" Whitworth - ASME B107.6 & BS192:1982.