Exotek hex wrench identification collar set
Exotek have released a set of mini identification collars for hex wrenches such as the ones from Hudy, Protek or Team Associated. These collars help to quickly locate the needed size and they are designed for the most popular sizes including 1.5mm, 2.0mm, 2.5mm and 3.0mm metric wrenches. They include 2mm holding set screws and work with all 1.5mm, 2.0mm and 2.5mm wrench shafts of 3mm diameter and the 3.0mm shafts of 3.5mm diameter.
Source: Exotek [exotekracing.com]