MCTi M8X15mm Bicycle Crank Arm Fixing Bolt with Cap For Square Taper Bottom Bracket Titanium Screws 2 Packed Size: M8x15mm Square Taper Bottom Bracket Screw + Cap. Material: 6AL/4V(TC4)Titanium, Grade 5; Total Weight: 10.66g/piece Bolt Thread Pitch: 0.8mm, Bolt Thread Diameter: 8mm, Bolt Allen Key Size: 8mm Cap Diameter: 22mm, Cap Inside Diameter: 13.5mm, Cap Thread Pitch: 2.5mm MCTi Brand Trademark Bolt is with high performance, corrosion-resistant, lightweight, high strength.