1. It can reduce high stress concentrations and it is butt-welding flange with teh best design 2. Our products include flat-welding flange, butt-welding flange and so on with high rigidity and better tolerance 3. And we can make them according to customers ***ailed request like drawing or samples 4. If you are interested in our products or have any questions or want to get more infomation dont hesitate to contact me.