... , and one open, the other closed.Also we could make with 2 or 4 holes in the tube. The size ranges ... electronic finishing, the tolerances up to +/- 0.01mm.), high hardness , insulation, wear-resistant, high temperature-resistant, hot and cold shock-resistant. Customers ... Celsius 3 times not cracked15Maximum service temperaturedegree Celsius190018001400 99.8 high pure Alumina Ceramic tube (ISO9001)