CHM® 2 ml 9-425 Vials are uniformly flat bottom for security with inserts. It is equivalent in dimensions to 11 mm crimp top vials and 10-425 screw vials and can be used in the same autosampler. Can be used on all common autosamplers due to their geometry, including Aijiren, HTA, Shimadzu, Thermo, Varian, Waters, etc.