I just now decided to buy a brand tail lamp and bought the SIGMA Cuberider. The lamp is ansich class, but the mount ... an absolute bad design! Both supplied rubber grommets have been torn during the initial assembly! Fortunately had a set of O-rings at home, the construction but rather additionally secured with NEM cable ties, because you can wait in this mounting method just waiting until you lose the entire luminaire. Sorry SIGMA, but any low light for 5.00 has got a better (as screwed) support! Absolutely no purchase recommendation!