20/50Pcs Waterproof Tri Fold Rivets Aluminum Alloy Folding Blind Rivets with Sealing Washer O-Ring Tri-Grip Exploding Pop Rivets Lantern blind rivet - Reshaping traditional riveting technology Product Feature: The rivets are made of high quality all-aluminum body and mandrel, anti-corrosion and anti-rust, with strong grip, effectively preventing from falling off. Included Washer to seal any gaps,Added resistance to pull though,Wider effective grip range.Caulk or sealant is recommended when installing to be truly watertight. These are specialty pop rivets that work well when riveting to softer or weaker materials such as plastic, fiberglass or thin aluminum. Traditional pop rivets can pull through those materials when the joint is stressed due to the small bearing surface on the back side of the rivet. The usual work-around is to put a metal washer on the back side of the rivet before it is tightened, but that's always a hassle and sometimes impossible (when the back side is inaccessible). These tri-fold rivets eliminated the need for a backing washer. Large bearing surface on the back side of the rivet to distribute the load over a relatively large area. These rivets are a step up from regular rivets. They result in an increased holding area. Strengthening the longevity and stability of your riveted connection. Specification: Product Name: Waterproof Tri Fold Rivets Material: Aluminum Alloy Color: Silver Grip Diameter: 5.2mm/6.4mm Note: Please confirm the size before purchasing. Light shooting and different displays may cause the color of the items in the picture to be slightly different from the real object. Due to manual measurement, please allow +/- error of 0.5-1 mm. _x000D_