2019 Polaris XP4 1000 on rear flex bar (1.75 diameter). The hinge is adjustable according to the opening or size of the bottle, extinguisher, gun, etc. The torque required to fasten the fire extinguisher bracket is key to the load balancing hinge of the bolt. I put a thin piece of rubber over the clamps to make it slightly larger to ensure an even load on the clamp. There is no movement. Works well. 200 miles The fire extinguisher through the desert and forest trails didn't detach or move from my tape tracks. Very pleased with the appearance and reliability of the attachment.