They fit perfectly on a Rogue Monster. They have funky adapters to get smaller hardware to work. It works and was a fraction of what Rogue charges.

I’m using 16 inch Rep crossmembers on my Rogue Monster. Perfect fit.

Simple design and works almost like axle collars clamping on things that other clamps are loose on.

Cheap storage horn that does what you want. The screws are long. Takes forever to screw in but I think it adds strength.

My objective take having this vs the Darko. The Darko is tighter on the rack while also being more solid. The F6 has some play. I got for the 4 bar option. It’s so tight especially if they have standard TPB thick collars. In practical use I don’t store more than two bars.

For the price this attachment is a no brainer. Clone of pricier options.

These are crazy heavy and solid. They are full of crü stickers.

This might be the ugliest plate in my collection. That’s something special.