You are purchasing 50 rivets(O ring included)
1. The kit comes with 50 aluminum rivets and 50 water proof O - rings.
2. Material: ALL Aluminum No plastic. Aluminum Body with Aluminum Mandrel
3. Style: Tri-Grip rivet. Back Side splits in three directions for superior holding power.
4. 3/16" hole size. Rivet tool required for installation (not included) Grip 1/6" - 1/2" (4MM-12MM)
5. These rivets will work great on almost any application on kayak like rod holders, pad eyes, terminal ends, handles, etc.