The vials are preferentially used on instruments of the following manufactures:Beckman, CTC, Gilson, Knauer,Shimadzu, Spark,Varian,VWR (Merck®)/Hitachi, etc. (Please have a look at the autosampler compatibility chart to confirm the models. If you are interested in our product, please contact us in e-mail or phone. Our e-mail is 3313345338-qq-com,the “-” in the former means at, and the later one means comma. Our number is 86-0570-3671199.