Neck size; 223683: 2 mL Clear Serum Vial, 13mm Crimp: 15 x 32: Clear Type 1A Borosilicate: 2: 13mm Crimp: 700000: 2 mL Clear Serum Vial, 13mm Crimp: 15 x 33: Clear Type 1B Borosilicate: 2: 13mm Crimp: 223693: 3 mL Clear Serum Vial, 13mm Crimp: 15 x 32: Amber Type 1 Borosilicate: 2: 13mm Crimp: 223684: 3 mL Clear Serum Vial, 13mm Crimp: 17 x 38