12mm axle with cnc cut to save weight and spiry helicoid cut to prevent axle stuck with dust and mud and prevent the axle stuck in the hub, allen key design at front head and rear end to make a longer life use. SPEC: 135mm SHIMANO® hub / Length 168mm / 12x1.75 W/i nut 142mm SHIMANO® hub / Length 171mm / M12x1.5 W/i nut 148mm SHIMANO® hub / Length 177mm / M12x1.5 W/i nut 150mm SHIMANO® hub / Length 183mm / M12x1.75 W/i nut 135mm SRAM® hub / Length 167mm / M12x1.75 W/o nut 142mm SRAM® hub / Length 174mm / M12x1.75 W/o nut 148mm SRAM® hub / Length 180mm / M12x1.75 W/o nut 150mm SRAM® hub / Length 182mm / M12x1.75 W/o nut OPTION: MATERIAL: AL6066-T6 axle / Nut (SPAX-C2-66) M12 x 1.0 THREAD / M15 x 1.5 / M14 x 1.5 Custom length thread design available 12mm / 15mm axle custom design available