321 stainless steel metal hose, the inner bellows are made of 321 stainless steel, 321 material is a high-temperature material, containing titanium elements, titanium is characterized by good toughness and folding resistance; bellows encryption treatment is softer, which enhances fatigue resistance. Therefore, it is more suitable for high-temperature dynamic use. The outer steel wire mesh sleeve is made of 304 stainless steel. The ordinary mesh sleeve is 9 steel wires per strand. We have added 4 steel wires, which are 13 steel wires. There is almost no gap between each strand and each steel wire. Even if the oil leaks after a certain period of time, the 260-degree heat conduction oil will not be sprayed out and hurt the operator. It is safe and guaranteed. Obstacle.