The 09857 is a package containing sockets and rivets designed for creating connection points. This kit includes 100 sets of rivet-style sockets and their accompanying rivets. These components are designed for a 10mm (3/8") snap size and are intended for installation onto mat materials. They are used with the Desco 09867 Snap Attaching Tool to provide a secure and reliable connection point for grounding or other purposes on industrial mats.