RG316 coaxial cable for use with high-power (400w) baluns and hook-up cables in microwave projects. PTFE insulation which does not melt when soldered - and capable of high-power use despite it's 3mm diameter. It's the same size as RG174.
This is not a "long run" feeder coax - it's more suited for baluns and short internal hookups (eg: transverters).
Sold in by the metre (and up to 10m per single length), eg: Order 5 for a 5m length. Ordering 12 will get you 10m+2m lengths.