The silicone tolerance is about 280 degrees. Suitable for chimney: 4.5-10cm (more than 4.5cm, you need to cut the rubber ring yourself). Method of use: (1) Open the chimney hole of the tent: 1. Determine the position of the chimney mouth on the tent, 2. Mark the screw hole position of the chimney mouth according to the circular steel plate and open the hole. (2) According to the circular steel plate of the silicone sleeve, cut two wear-resistant materials with the same shape as the steel plate (thick cloth can also be used instead). This step can also be omitted, but adding wear-resistant materials can better protect the tent from wear and tear. (3) Put the cut wear-resistant material and steel plate inside the tent opening, and insert the screws from the inside to the screw holes. (4) Put strong materials, silicone eaves and steel plates in sequence outside and tighten the screws with nuts to secure them. (5) Cut the tent cloth on the inside of the silicone ring to complete the opening. (6) After installation, insert it into the chimney and use it. When the diameter of the chimney is more than 4.5cm, you can cut the silicone ring yourself. Safety protection. It can prevent the hot chimney pipe from directly touching your tent or your shelter, and prevent the high temperature from igniting the tent and causing a fire. Sturdy and durable. This tent chimney insulation blanket is made of high-quality environmentally friendly silicone. Environmentally friendly, wear-resistant and high-temperature resistant, not easy to damage or deform, and the steel floor is not easy to rust and is very durable. Wind and waterproof. Our tent stove jack kit has good weather, water, wind and UV protection, it is perfect for outdoor use, no matter the weather or season. VERSATILE USE. This practical tent stove jack kit can be used in a variety of places and can be combined with c-clock tents, tents, yurts, cabins, shelters, boats, barges, summer houses, workshops, garages and any other needs. The place is used in conjunction with anything that uses a flue.