The 16mm (5/8") opening in the cone design allows a delivery tube to be inserted so liquid does not have to be poured out. The shortened lid allows only the cap of the bottle to protrude for safer pouring. Both carriers hold standard US reagent bottles. Shatter resistant polyethylene…

White PVC Dissolution Vessel Carrier and Holders in 2 Sizes Has a 4 3/8" diameter opening Corners are open to allow water to flow through and allow carrier to dr Holds six vessels