They have a wide flow, stronger near the pump outlet and widenening greatly. Still definitely strong enough to blow even large grained sand about in a large tank. I had to fiddle with mine several times to get them to not make divots in the sandbed and still provide good flow.

Still the best powerheads you can buy for the money in my opinion.

The mounting hardware is a pain as they are designed for euro style tanks but you can get other options from Tunze including a magnetic mount which will be available soon.