The Invincipole is a durable aluminum downstem that goes hand-in-hand with Invincibowls. Invincipole aluminum downstems fit most bongs with an 18mm joint and are made with telescoping technology. They are designed to adjust in length to between 3 and just under 6 inches — how nifty is that?! Finding the length of a broken glass downstem can be a nightmare. The Invincipole makes it a dream by allowing you to slide the diffused downstem out for a perfect fit for any 18mm bong. Invincibowl prides themselves on the fact that no other company offers something like this, so you truly are getting a smoking accessory that is the first of its kind. Invincipoles feature a multi-hole diffuser that drastically improves water filtration and a precision 14mm taper that offers a guaranteed bowl fit. Invincipole downstems feature a multi-hole diffuser which houses the final ash defence system, their proprietary stainless-steel screen.