This oxygen sensory thread chaser set (18x1.5mm & 12x1.25mm) features carbon steel construction for efficient thread repair and oxygen sensory socket. Ensuring smooth debris removal while reducing threading risks, with 3/8inch drive compatibility for wrench integration. Ideal for automotive technicians and enthusiasts maintaining vehicles with damaged oxygen sensory thread or corroded installation. Perfect for garage repairs, effectively restores thread in confined engine compartments and aligns mismatched oxygen sensory socket connection. 41mm design combines industrial durability with lightweight portability ensuring workshop overhauls.