Recently I purchased 2 * 30m. combi cable SDI-UTP, diam 14,5 mm, to feed my PTZ and retrieve video signal.
Cable manufacturer drum's proposal are huge in size and expensive. So I decided to try a medium size and less expensive drum.
So I tested this AdamHall 70225 , which is the Schill 310 equivalent but a bit bigger... And I have to say this does perfectly the job for this 30 m. combi cable ! 25 m. should be perfect but 30 m. will just fit in if you roll the cable carefully, with 2,5 m. on auxiliary winding.
I like the small footprint, lightness, robustess, locking brake, and high handle which allows a bit more space for more cable.
I like less small diameter of internal cable pass. I you have a Neutrik RJ45 connector you have to put cable in from opposite extremity... not the end of the world.