Clear Glass, 5*31mm Insert, Flat Base, 100pcs/pk. 2ML-N1002, Clear Glass, 5*29mm Insert, Conical Base with Polyspring, 100pcs/ 5mm Vial Micro Insert Conical Base With Polyspring - Aijiren. Zhejiang Aijiren Technologies Co.,Ltd is one of the leading China 5mm vial micro insert conical base with polyspring manufacturers and suppliers,