Silicone tolerance is about 280 degrees. Suitable for chimney: 4.5-10cm (for chimneys larger than 4.5cm, the rubber ring may require trimming). Method of use: (1) Open the tent chimney hole: a. Determine the position of the chimney opening on the tent. b. Use the included circular steel plate to mark the screw hole positions and cut the opening accordingly. (2) Cut two pieces of wear-resistant material (such as thick fabric) to match the shape of the steel plate. Note: This step is optional, but using wear-resistant layers helps protect the tent from abrasion. (3) Place the wear-resistant material and steel plate inside the tent opening. Insert screws from the inside through the marked holes. (4) On the outside, place the wear-resistant layer, silicone sleeve, and steel plate in sequence. Secure with nuts and tighten the screws. (5) Carefully cut the tent fabric inside the silicone ring to complete the opening. (6) Insert the chimney pipe through the opening and use. For chimneys over 4.5cm in diameter, slight trimming of the silicone ring may be necessary. Safety protection: Prevents direct contact between hot chimney pipes and tent fabric, reducing the risk of high-temperature ignition and fire hazards. Sturdy and durable: Made from high-quality, environmentally friendly silicone that is wear-resistant and high-temperature resistant. Resists damage, deformation, and rust. The steel components are corrosion-resistant for long-lasting performance. Wind and waterproof: Provides excellent protection against weather, water, wind, and UV exposure. Ideal for outdoor use in various conditions. Versatile use: This tent stove jack kit is suitable for various applications and can be used with bell tents, camping tents, yurts, cabins, shelters, boats, barges, summer houses, workshops, garages, and other structures requiring a flue passage.