The Teng Tools Industrial Adjustable Wrench made of chrome vanadium steel for increased strength and durability. Graduated markings on the jaw allow the size of the fastening to be accurately measured and the wrench to be set at the right size. The 15° jaw angle allows the wrench to be used in narrow spaces, as only 30° turning is needed. Its wide jaw opening increases the range of bolt sizes to be worked on. Non-protruding, moveable jaw end for better action when space is limited. Fitted with a comfortable fit handle. It Exceeds international standards ISO 6787-1976, ASME B.107.8M-1996, BS6333-1995, DIN 3117-1988 and JIS B4604-1976.