The Snap Seal™ vials can be securely sealed with Poly Crimp™ seals or aluminum crimp seals. The vials incorporate the unique design that precisely centers a limited volume insert in the vial neck, assuring dependable, reliable use with autosamplers. Polypropylene vials; Clear vials; 11mm crimp neck finish; Dimensions: 12mm Dia. x 32mm Hgt.