Standard opening vials require 5mm inserts, Wide opening vials 6mm Inserts Shop Fisherbrand™ Micro-Insert, Clear Glass, for small opening vial at A. OEM Items - E&I Cooperative Services 97, 88, KT748001-0003, 748001-0003, Kimble Chase, SET LAB FOAM INSERT KONTES 266, 257, 1367522, 357543, Corning Life Sciences Dl, PIPET SEROL 5ML X 1/10