The CTA 5-pc Fuel Line Flex Sockets, No. 1809, are designed to flex at 45 degrees to securely grip the direct fuel line. The sockets adjust to the proper angles around the direct fuel line for a reassured grip without losing torque. The Fuel Line Flex Sockets are designed for BMW N54 and N55 chassis models where the steel lines cross the valve cover. The sizes include 11mm, 13mm, 14mm, 15mm and 17mm sockets, which are all used with a 3/8" square drive. The sockets are interchangeable with a simple removal of a lock pin, and the kit comes with replacement pins.