Wholesales autosampler vial caps with inserts for lab use aijiren’s 2ML Crimp Top HPLC Vial can be used with Micro-Insert to hold a small amount of samples to be tested,or precious samples. Put the sample into the Micro-insert,put the Micro-insert into the 2ml Crimp Autosampler Vial,fix the Cap with Crimper,and then put it into the Autosampler for testing.