DescriptionDiabolic Grade 5 Hollow Titanium BMX Sprocket Bolt: 3/8″ 24 X 16 (Fits Profile, Madera & Old School GT Cranks) & M10 X 1 (Fits Odyssey Wombolt, Twombolt & Thunderbolt Cranks)Machined from aerospace grade 5 titaniumUses common 6mm hexWill never rustComes in different anodized colorsLifetime warranty to original ownerGun Drill Hollow, 6 grams or 50% lighterDiabolic Grade 5 Titanium BMX Sprocket Bolt: M10x1.5x16mmBe sure to use good 6mm allen wrench & anti seize compound on threads: