14mm male 90 degree 4mm wall thick quartz with glow ball glass collector dghfuujsdkk <b>feature:</b><br> quartz crystal:quartz is made of natural crystal and silica<br> high temperature resistance:quartz glass can be used at 1100 ° c for a long time.<br> good thermal stability. quartz glass has a very small coefficient of thermal expansion<br> can withstand severe temperature changes, and is stable at high temperatures.<br>in addition to hydrofluoric acid, quartz glass hardly reacts with other acids.<br><br> <b>quality after-sales service:</b><br> for the same goods, we have better quality assurance<br> premium quality, price match guarantee, please rest assured to buy<br> please feel free to contact our customer support team when you have any question,and you will receive a satisfactory reply