This is a Mugen aluminum round shift knob with a sporty, Spartan image. The 48mm ball design fits comfortably in the hand, allowing for secure shifting. 8/10mm adapters are included. Adapter thread sizes: M8 x 1.25 M10 x 1.25 M10 x 1.5 Main body thread size: M12 x 1.25 If you are considering replacing your normal shift knob, regardless of whether it's an automatic or manual transmission, please consider this opportunity.