Extended Aluminium Stem Catcher Knob for Brompton Gives you more flexibility in terms of setting up non-standard handlebar and brake lever angles, adding extra accessories and holders to the handlebar. NOTE: could be not compatible with new lines (P-line & T-line). Apparently, the size of the thread on these lines is slightly larger. Feature: extended length Approx weight: 3.8g Customise, modify and upgrade your ingenious design Brompton. This knob is CNC machined out from Aluminum and beautifully anodize in various vibrant colours for you to customize your Brompton. Direct replacement to your current stock catcher knob.