Clean, tough, and simple Tighten up with a 6mm Allen key. Features a 6mm Allen key on the drive side of the axle if you manage to round the non drive side Constructed from 7075 aluminum and made to manufacturer's exact specifications 172mm fits many models from 20172021. See burgtec.co.uk website for full list 175.5mm fits many models from 20162021. See burgtec.co.uk website for full list