MCTi Mountain MTB Bike Chain Rings Titanium Bolts Screw for Sram Shimano FSA Rotor 3.5mm 4 Pairs Packed Colorful Size: 3.5mm Chain Ring Bolt; Color Available: Colorful,Gold Material: 6AL/4V (TC4) Titanium Alloy, Grade 5; Total Weight: 2.15g/piece. Head Diameter: 12mm(Bolt)/12mm(Nut); Head Height: 2mm(Bolt)/2mm(Nut); Thread Diameter: 7.8mm(Bolt) MCTi Brand Trademark Bolt is with high performance, corrosion-resistant, light weight,high strength and durability functions. Original Brand Packed. Many applications especially in sports, mountain bike, bicycle, motorcycle, automotive, racing, aerospace, medical industry and DIY areas.