The Wohler 4753 VIS Camera Trolley, Camera Head Holder Kit with Camera Sleeves is designed for use in air ducts sized dia 6" and above or 6 x 6", in waste water pipes and air ducts as well as seamless chimneys. It can be used in combination with customary accessories such as supplementary lighting, the stabilization sleeve, and coupling protection sleeve. The Wohler camera trolley offers numerous adjustment options. which can be set with just one hand. The camera head is securely attached on the trolley or hangs protected below the trolley, ensuring the best possible clearance between the optics and the pipe walls. It is also possible to push the camera trolley forward in any position. Even when it tips to one side, it just keeps on rolling on.