Bolt & socket-drive sprocketMaterial: 6061 T6 aluminumSize: 25t, 26t, 27t, 28tTeeth: 1/8"Bore (mm): 23.8Thickness: 8mmAdapter: 19mm & 22mm includedExtra info: lightweight sprocket, runs directly on 24mm spindle, sinked adapter for better chain alignment, hollow cnc spokes for reduced weightWeight (kg): 0.062 (25t)Color: black, gold, oilslick, high polished, blue