Camlock Systems tubular keys have all kinds of applications. They are especially common in vending machines, electric cabinets, parking bollards and Chargemaster electric vehicle charging stations.
Camlock keys (sometimes labelled Sidlock) usually have some sort of code number written on. Codes are usually in the format of R, T, 8T or H, followed by 5 digits, e.g. R23728. Sometimes they may consist entirely of numbers, e.g. 70200.