The NA GRANI HMD is a Russian heating system designed for an "open" heating setup, i.e. without a top lid for Russian-style use.
The NA GRANI HMD shisha pipe heater is made of stainless steel and can be used with 2 to 3 coal cubes depending on the intensity you want.
Bottom diameter - 74 mm
Internal diameter - 56 mm
Depth - 24 mm