WATERPROOF ALUMINUM BULB TILE RIVETS WITH WASHER
Bulb rivets come in many varieties. Weather tight bulb rivets come with an attached EDPM (rubber) washer set at the base of the hat. When installed these hats push the washer into the pre-drilled hole forming a watertight seal.
Tri-grip rivets have added benefits in terms of strength and clamping as well. The three legs that protrude from these rivets are used to better distribute pressure over a surface area. This means, more pressure can be applied to the material without causing damage to it. They also keep a larger portion of the mandrel inside of the body. This added material can help to cure the weaker shear strength of typical blind rivets.