... glass tube air dryerDescription:Glass instrument air dryer is to use various types of laboratory glasswares,laboratory glassware drying ... :(1) 12 holes,20holes,30holes,Can choose according to your need(2)Standard pipe,shaped tube,length,thickness ... or specific questions, pls not hesitated to contact me.. Once cooperation, forever friendship. Welcom to contact with Taikang 2012 Long use ...