Dimension Description: Shift knob adapter design for 10mmx1.5mm thread pitch . Outer thread diameter 0.39"&thread pitch 0.06". Bottom Inner thread diameter 0.55"/14mm, Plastic hoses diameter 0.31/8mm",0.39/10mm",0.43/11mm,0.47/12mm" Sturdy Structure: Shifter knob adapter is made of sturdy structure aluminum, which is wear-resistant and durable, not easy to break, and has a long service life Universal Gear Shift Knob Adapter 10x1.5, Aluminum Alloy Shifter Knob Adapter,Gear Shift Adapter for Non-Threaded Manual Shifters M10x1.5 (Black)