1、[DIES AND SOCKETS] Including thread dies, straight socket, long and short oxygen sensor sockets, with simple operation. 2、[MANGANESE STEEL] Forged with 65 manganese steel, surface rustproof treatment, high hardness and corrosion resistance. 3、[MAIN PURPOSE] Can be used with ratchet wrench and post to remove and install vehicle oxygen sensor or hex air switch. 4、[STANDARD SIZES] These dies and sockets have standard threads and sizes, which are easy to operate and not easy to slip or loosen. 5、[GOOD COMPATIBILITY] Suitable for Mercedes Benz and other most car models, good practicality and compatibility. Item Type: Automotive Oxygen Sensor Socket Material: Manganese Steel Straight Socket: Approx. 80mm / 3.1in high, 3/8in square hole, 22mm (7/8in) Short Oxygen Sensor Socket: Approx. 31mm / 1.2in high, 3/8in square hole, 22mm (7/8in) Long Oxygen Sensor Socket: Approx. 50mm / 2in high, 1/2in square hole, 22mm (7/8in) Thread Die: M12x1.25MM, M18x1.5MM 2 x Thread Dies 1 x Straight Socket 1 x Long Oxygen Sensor Socket 1 x Short Oxygen Sensor Socket 1 x Plastic Box