The GKTECH high tensile 4130 zinc coated tie rod extender conversions screw on to the end of M16 tie rods and allow the tie rods to travel further into the steering rack which creates more steering lock. Great for drift or getting out of parking spots. This product converts what are normally an 18mm inner tie rod thread to a 16mm inner tie rod thread which is a much more common size. In addition to converting to a more common tie rod thread this rack spacer set offers a grand total of 16mm of rack travel equating to around 12-15 degrees of extra lock without compromising on the amount of thread left in the steering rack. SOLD AS A PAIR - DIY installation - CNC machined high tensile zinc coated 4130 steel NOTE: will not work with OEM tie rods. This product is designed to convert your car to use M16 (on the rack side) tie rods as used on Nissan Silvias, Skylines, Z33 350z etc with a 14mm outer.