These caps are compatible with CTC Combi PAL (Varian, Gers, Shimadzu, ATAS), HP, Perkin Elmer, and Aijiren and are suitable for a wide range of Mill Finish Triangle Aluminum For Road Sign Aluminum Al Crimp Top (23) Magnetic Crimp Top (5) Magnetic Screw Top (2) we offer pre-assembled 20 mm magnetic steel crimp caps for Heaspace Vials.