Review on Hiwowsport 45 Degree 4-Ply Silicone Hose Clamp, 5mm Thickness, Ideal for Turbo/Intercooler/Intake Piping, Length 125mm, ID: 3.0'' (Black) by Zach Flores

Excellent construction; looks great, thick and holds pipes really well. outside diameter 3 inches; tantalizingly enough that after putting it on I was curious as to what the ID actually was, but didn't want to take it off and measure it because that would be a lot more trouble than it was worth. So tight on a pipe I didn't even need a clamp.