The AOT Provost has become the standard in HMDs. It consists of two parts, the tray and the vented dome swivel which sits atop the tray. The provost will cut your charcoal use in at least half and will prolong the longevity of your sessions hassle-free. The Provost does not only work with the AppleOnTop bowl, it also works with any standard size clay bowl. For best results on standard bowls, use the provost on top of your poked foil.