Unit Price: QIV-50S-PSA: 4x25mm insert for 8mm standard opening vial: 50 µl clear insert with bottom spring for 8mm standard opening: 50 µl: Pkg of 100: $96.44: QIV-100S-NA: 5x31mm insert for 8mm standard opening vial: 100 µl clear insert, no spring, for 8mm standard opening: 100 µl: Pkg of 100: $57.47: QIV-150S-PSA: 5x29mm insert for 8mm