Standard opening vials require 5mm inserts, Wide opening vials 6mm Inserts Shop Fisherbrand™ Micro-Insert, Clear Glass, for small opening vial at Fishersci.at Fisherbrand™ Micro-Insert, Clear Glass, for small opening vial conical,0,05 mL ,1 µL residual ,27.5 mm height Fisherbrand™ Micro-Insert, Clear Glass, for small opening vial