3-piece design Bolt-drive/spline drive crankMaterial: full heat treated 4130 Cr-MoLenght (mm): 170, 175Spindle: 24mm hollowSpindle splines: 48Extra info:strong lightweight crank,rhd & lhd compatible,investment cast pedal & spindle boss,compatible with spline drive and bolt drive sprockets,comes supplied with assembly toolWeight (kg): 0.833 (175mm)Color: black, chrom, acidized black