***Highly recommend installed by professional. *** The screws of the GTR coolant tank are NTP threads, with a thread angle of 60° and a flank angle of 30°. You just need to screw three or four threads, then use a wrench to lightly tighten it. NOTICE!! DO NOT forcefully tighten it to the end, the screws and threads will be damaged!! Application: Condition: Brand New Material: Made of high quality light weight aluminium and TIG Weld Approximate Tank Size: As Pictures Color: Silver/Black -Same size like original coolant bottle. -No mods required, direct replacement of original plastic coolant bottle. -Refresh the look of the engine bay. -Exterior level indicator displays level of sludge inside canister. -Holds 10% more coolant than original coolant bottle. -Professional installation only. Fitment: For GTR R35 full aluminum overflow coolant tank 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018. Package Included: 1Set* Aluminum Radiator Coolant Overflow Tank Note: 1. Please check your vehicle model and year to confirm this item is suitable for it before ordering. 2. Please allow for errors due to manual measurement. 3. Installation: Instructions not included, highly recommend installed by professional. 4. Color Difference: The color of the products may deviate from their pictures due to lighting and the use of different monitors.