UPANBIKEUrban Road Bike Bicycle Retro Handlebar 31.8mm Moustache Shape Wide 640mm

Received my bars and the sweep angle is 35 degrees...had to end this with a question mark so the system would accept it?

Is it 31.8 or 25.4? I see it written both ways.

Can Upanbike confirm the sweep? The 25.4 clamp version states 25 deg, a purchaser states these are 35 deg. They look the same.

Would this work with ergonomic grips (e.g., Ergon GP5's)?