The opening of funnel has one flat side to act as scoop and the bottom of the funnel has threads to be able to screw it on top of the mini glass vial (not included) in order to make it easy to shovel and scoop.
Please note in the pictures a vial is shown that is not included but the size is mentioned to make sure that you buy a proper size.
Size:
Flat side length is one inch.
the bottom opening of funnel is 0.5 inch.
the height of funnel is 1.25 inch.
So any mini vial with opening outer diameter of 12mm (0.47 inch) can fit this funnel.
Specially you can buy our mini glass vials that fit this funnel.