Features: *LIFETIME WARRANTY – Against cracks & breaks on the arms & spindle to the original purchaser Sizes: 165mm, 170mm & 175mm Spindle: 19mm Hollow/ Heat Treated Chromoly Spindle Bolts: 3/8″ x 24T Flush Mount Spindle Splines: 48 Sprocket Bolt: 10×1.5mm Mid 19mm BB, cones, & washers sold separately Weight: 22.2 oz (175mm arms only) Warning! Returns for cranks that have been used/installed are NOT accepted. Our Revolt cranks were proven/ tested by our whole team. We added a new heat treatment process, thicker tubing & made them w/ a stiffer shape. All for those that need the security of a stress-free crank. The Demolition crew stands by them & swear they are the strongest cranks they’ve ridden. Heat-treated tubular chromoly arms w/ a forged spindle boss that is flush w/ the arm to reduce ankle scarring, 48 spline, 19mm hollow chromoly spindle & flush mount spindle bolts. RHD/LHD compatible. And, they come w/ a manufacturer's Lifetime Warranty against cracks & breaks.