T Bolt Set M8x20mm T Slot Drop-in Bolt Hammer Head Bolts T Shape Stud Sliding Screw with 10 Pcs Hexagon Flange Nuts for Aluminum Extrusion Profile Photovoltaic Solar Mounting, sliver

I found these and ordered these to mount my solar panel to adjustable mounts, so that I would not have to deal with trying to get a wrench in the slot to hold the nuts. Worked like a charm made the project so much easier. High quality.

These worked great for installing an easily-removable lumber rack on the T-tracks in my roof rack. A bit of thread lock on the bolts was helpful.

I'm very impressed with the look and finish on these. I was a little worried when buying them that they'd be something much lower quality, but color me impressed. They're very well machined.

Quality stainless hardware, no issues identified. It did not come with any storage container just a plastic bag, it would be better if it had better packaging

Worked great for my solar project on my naturenest RTT rack supports. High quality too; I don't feel these will rust.

Used it for a project mounting solar panels to my rooftop tent. Good quality and arrived quickly.

Garbage, do not waste your time or money on these

I was having a really hard time finding a tbolt/nut that fit the rails on my roof top tent, but these fit perfectly. They don't have to be an exact t channel fit, they can rotate to some degree and lock in. I'm using them to hold a solar panel on my roof top tent cross bars.