Tri-Fold: 1/2 in Head, 3/16 in Mandrel, Aluminum Select: Tri-fold / Exploding 1/2" Head 3/16" Mandrel Grip range: 0.030" - 0.400" All aluminum Color: Black, White, or Chevron Blue Quantity: 50 count 100 count Box of 250 Tri-fold rivets are designed for those instances when using a backup washer is difficult or impossible. These rivets separate into three legs to spread the clamping force over a larger area, similar to a backup washer. Tri-fold / exploding pop rivets are available in a variety of colors. Constructed from the highest grade alloy used in the industry, our Tri-fold rivets boast a breakload exceeding 700 pounds. Compared to common breakloads of 350 pounds, this rivet will set twice as tight. "Breakload" is what determines how tight a rivet will pull before the mandrel breaks/snaps. With a minimum grip of only .030", this rivet will extend to .400".