This Big Over-Engineered Knob (BOEK) fits all of the Lido OG, OE Fixie, as well as all of the Lido series grinders. Made of machined Delrin (POM) and has 2 roller bearings on the shaft for smooth operation. It measures 40mm tall x 40mm across the flat top. Fits the hand nicely! The knob comes completely with axle shaft, and for the OG or Fixie all you need to do is remove the retaining screw under the handle, and install the knob with axle shaft. For Lido 2, 3, E & ET, as well as the Basic, you will need to remove the axle shaft from the knob, and install the knob on your current knob shaft. If you have the earliest production of Lido 2 you will need a new knob shaft - email me!