Good quality professional tool3/8 inch double square hole drive6 point socket 22mmOffset design socket allows access in hard to access areasPerfect for heated and unheated oxygen sensorsCut-out section allows socket to pass over wiringFit For most Japanese Type VehiclesThere are no instructions included in this kit. Professional Installation Is Highly Recommended Check Size purchase.Material: SteelColor: BlackType: Sensor WrenchLength: 80mm/ 3 inch ()Square Hole Dimensions: 3/8 inch(10mm)Sleeve Dimensions: 22mm/0.87 inch ()Package contents: 1* Oxygen sensor disassembly toolNote: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.