When riveting products, how to choose round head blind rivets and countersunk head blind rivets?

This mainly depends on the final effect we achieve on the product. After the round head is pulled, there will be a round head on the surface. After the countersunk head pull stud is pulled, the surface can be kept flat, but the premise is that the countersink must be drilled. A little troublesome, it can keep the product beautiful, and it does not affect the connection of other workpieces on the same plane.