The KF850OEM Rixen & Kaul Klickfix Handlebar Adapter 26mm (OEM packaged) is the same as the KF850 adapter, but it is packaged for sale as part of a complete bicycle rather than as an aftermarket accessory.
The Klickfix Handlebar Adapter is a bicycle accessory designed to allow for easy attachment and removal of various types of baskets, bags, and other accessories on the bicycle's handlebars. It is designed to fit handlebars with a diameter of 26mm.