50pcs 4.8*20.5mm Black Painted Aluminium Trifold Blind Rivets Large Flange Rivets Aluminium Load Spreading Rivets Nail Pop Bulb Blind Rivet Structural Blind RivetMaterial:alu/aluSize:4.8*20.5mmColor:blackWeight:105GPackage:50PC/PACKFeature:High strength,alu/alu materialUsage:The rivet splits into 3 huge ribbons on the blind aspect to distribute the loadGood functionality over quite a lot of clamping thicknessesExcellent for brittle and gentle materials, prevents cracking