CTA Tools 2089 12-Point Triple Square Tamper-Proof Wrench - 18-Millimeter is designed to service fasteners on VW, Audi, Porsche and some Detroit Diesel engines. It features a 2-piece design for high torque applications. This wrench is precision machined for an exact fit. Wrench dimensions are 1/2-Inch square drive and 2.5-inch in length. Heavy-duty steel construction allows for strength and durability. Whether tuning up your '68 Corvette or changing the oil on a John Deere tractor, CTA can supply you with the tools needed to do the job. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.