GT Power Series 48 spline 3 piece chromoly cranks with spindle and bolts The GT Chromoly crank classic is back with the same arm shape, a modern 19mm x 48 spline hollow chromoly spindle, and flush mount spindle hardware * Color: BLACK * Material: 4130 chromoly arms and spindle  * Arm length: 175mm * Spindle: 19mm diameter, 140mm long, 48 spline, for sealed bearing bottom bracket (BOTTOM BRACKET NOT INCLUDED) * Crank Bolt Threading: M12x1.0 * Includes: LH and RH arm, 19mm x 140mm  spindle, 2x spindle bolts with concave washers, assembly grease, torque bolt for chainwheel * Weight: 28.9 oz. (without BB) * Uses 9/16" spindle pedals.