Microsolv Technology Corporation Vials, Headspace, Crimp Top, Glass. Clear. 20ml, 20mm Serum Finish, 22.5x75.5mm outer dimensions, Special Top and Flat Bottom for use with SPME Caps. CTC Compliant. 100/PK. Supplier: Microsolv Technology Corporation 95025SPME. First hydrolytic, Class A, Type N51A pharmaceutical grade, Borosilicate Glass.