I could tell straight away that the K&F Concept cage was made for rough treatment rather than show. It is milled from aluminium, not the lightweight plastic that DJI supplies, and it has that reassuring chill when you pick it up on a cold morning.In the box you will find a silicone lens cap, two cold shoes on the top and a pair of quarter-inch tripod threads on the bottom. The magnetic base clicks neatly on to DJI’s quick-release mounts, and every button, port and the battery door stay fully accessible.After a couple of weeks of cycling, scrambling over rocks and the odd drop, the cage has picked up only a few faint marks. I have clipped it against handlebars and scraped it across granite without a scratch appearing on the lens cover. The extra mounting points carry a Rode microphone and a small LED panel at the same time, and they do not twist loose.There are a few quirks. The additional metal adds about seventy grams, so gimbals need their weights adjusted, and the first time you slide the camera in you have to line it up carefully or the latch will not close. The silicone cap can also flutter in a stiff north-easterly, so I wish it clamped a little tighter.At around forty-five quid it is not exactly pocket money, yet it is still far cheaper than replacing a damaged 360-degree lens. With its solid build, easy charging access and sensible mounting options, it now has a permanent place in my kit bag.