The length of the downstem is measured from after the connection piece.
NOT THE TOTAL LENGTH OF THE GLASS
FREE SHIPPING FOR YOU MY FRIEND.
Look closely at the pictures, there are two styles depending on your bowl piece size. – one has a bulb between the connector and the slide.  This is a 18mm connector with 18mm Female Slide for the bowl – the other is STRAIGHT from connector to slide.  This is a 18mm connector with 14mm Female Slide for the bowlAlso is a 14mm-14mm downstem
IF YOU ORDER THE WRONG SIZE, THAT IS NOT MY FAULT. CAREFULLY MEASURE, DON’T GUESS.
Both styles/sizes have a downstem width of 13mm
Buy two downstems and I’ll include a 3rd for FREE of the same size as you purchased
CHECK MY STORE FOR OTHER DISCOUNTED SMOKING PIECES