Traditionally used in the UK for all serious forms of towing and generally the most cost effective option. A 50mm towball is bolted to a two or four hole plate (vehicle dependant) that also allows the fitting of a 25mm spacer so that accessories such as a towbar mounted cycle carrier can be used.
Exclusive to Witter and only recently introduced this version offers all the versatility of a fixed flange bar whilst leaving very little of the towbar visible when detached.
Mainly used in the rest of Europe and slimmer than a flange bar this style was the first to offer a detachable version. Cycle carriers are available for this type of bar but you cannot tow at the same time.
Mainly used outside the UK and the least flexible design as no additional accessories can be used. Cycle carriers are available for this type of bar but you cannot tow at the same time.