The Supa River Keepnet from CRESTA is very robust in every area and therefore very suitable for use on canals and rivers with shipping. First of all, it is made with a CNC machined metal block that is threaded in both horizontal and vertical directions. The coarse, rectangular mesh (6x9mm) is very resistant to abrasion and, thanks to the relatively large openings, allows water to easily pass through, making it less likely to be pulled from its place. The top aluminum ring has an enlarged diameter, while the other rings are individually equipped with a protective, wear-resistant layer. The bottom is provided with 2 attachment points for adding weighting if desired.