The 10-pc Flare Nut Socket Set - EGT & Fuel Lines, No. 8857, from CTA Tools, features specially designed sockets for installing and removing injector lines and exhaust gas temperature sensors without damaging any wires, housing, or threads. The sockets come in both straight and offset designs for clearance issues and use an open hex design for additional clearance. The set includes 13mm, 14mm, and 17mm 3/8" drive sockets and 19mm and 21mm 1/2" drive sockets. The entire set comes in a blow-molded case for organization and portability, and the sockets are made of medium carbon chromium molybdenum alloy steel.