What are the advantages of all iron double sided countersunk head staples?

Double countersunk head set, both sides of the material must be punched countersunk holes Insertion can be reversed to improve access to riveting tools, unique "pumped up" mandrel coreless head maintains consistent clamping force anywhere in the application Strict radial set provides structural stiffness Increased high speed automation, POP riveting demo facilitates cycle times Fastest speeds of 2 seconds

Color mandrels for quick visual identification of different part sizes?