We've made a few of these lap timer mounts over the years for our own bikes, and had a lot of interest in them... so we decided to make a run of them. -We have 4 options at the moment, solo, solo2, 41mm forks, 50mm forks. -Our next run will have some 37, 51, and 53mm versions available - (available late Jan). -Made from 7075 Al. Very light and strong. -Hardcoat anodized -Come with all necessary mounting hardware -Designed so that the power port can be plugged with with either model $50 shipped in the US. Let me know if there are any questions please!