Use for installation and removal of 18mm spark plugs found on many motorcycle applications. Magnetic insert for secure install of spark plugs. Services Street-touring-motorcycles, Street-sport-motorcycles, Off-road-motorcycles, Street-cruiser-motorcycles, Snowmobiles, Utility-vehicles, All-terrain-vehicles, Street-motor-scooters & Marine-personal-craft. Size: 18mm x 6 Pt. Drive: 3/8”.