... 13mm, 19mm, 25mm, 32mm Standrad Lenght: 2M Certification: FM Rubber Foam Insulation Tube / Pipe features good heat protection, strong load bearing, non-water ... 19*7625*7632*7689 80 19*8925*8932*89Thermal Insulation Tube for example: 19*89, it means the 19(NT) ... size is 89mm.About the Thermal Insulation Tube inner size ≥89mm, we suggest use the same thickness of the plate., Rubber Foam Insulation Tube