Use: This tool set is used to remove, inspect, replace, and install oxygen sensors and vacuum switches on vehicles and engines. Package: There are 5 sockets and wrenches included in the red case, 1 x 3/8" Drive Extra Deep Pin Socket (3-1/8" Long), 1 x 3/8" Drive Low Profile Pry Bar Socket Wrench (1-1/4 ... 1/2" offset crowbar (1-15/16" long), 1 M18 x 1.5mm thread punch and 1 M12 x 1.25mm thread punch with 3/8" drive for cleaning and repairing damaged threads. Material: These sockets and wrenches are forged with high quality steel and gain high strength for better performance. Design: The special side cutout design allows easy access to the oxygen sensor from the section and prevents damage to the thread.