Description: Put a slot in the side of this wrench to accommodate connectors on heated oxygen sensors, which usually do not fit in the standard sensors wrenches. The extended and reinforced body removes the most stubborn sensors without rounding them off. Features: 1/2" drive of double square. 22mm (7/8") of hexagon. Flare nut for vacuum switch & oxygen sensor service on the computer-controlled engines. Application for Ford, Toyota, Nissan, BMW and most of the European cars. Specification: Material: Metal Window/slit within socket: Approx 12mm/0.47'' Socket depth: Approx 48mm/1.89'' Size: As the Picture Package Includes: 1 Piece Car Oxygen Sensor Removal Nut Socket Tool Note: Please check the size measurement and the picture carefully before making payment. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm)