【Square Taper Crank】104mm BCD,Crank Arm length 170mm,165mm,152mm, Suitable for Mountain Bike. 【High-strength aluminum alloy 】Cranks made of aluminum alloy, Light weight, Stylish, High compatibility,Durable. 【Professional Design】Ergonomic shape utilizes the stampede acting efficiently to create more stampede traction. It can help you make your riding easier and more comfortable. 【Package Includes】1 Square Taper Left And Right Crank 【Guarantee】We guarantee them all with a 100% product guarantee and promise to offer you the best customer service, if you have any question please kindly feel free to contact us.