The KG836 Rixen & Kaul GTA Coupling Set II is a great accessory for the Rixen & Kaul GTA bike rack system. It is designed to allow for easy attachment and detachment of bags or baskets from the bike rack. The coupling set includes two components that are mounted onto the bag or basket, which are then compatible with the GTA bike rack, allowing for quick and easy attachment and detachment of the bag or basket. This coupling set is made of high-quality materials that ensure its durability and longevity. It is easy to install and does not require any special tools, making it a great option for cyclists who frequently carry cargo on their bikes.