The Prowheel One Pair Bike Crank Arm is a high-quality aluminum crankarm designed for racing bikes. With a length of 152mm and a weight of 1.15 pounds, this crankarm is durable and efficient for cycling enthusiasts. The ball bearing design ensures smooth and reliable performance, making it a great addition to any racing bike. Available in square hole form, this crank arm is a sleek and powerful component for enhancing your cycling experience. Look close at pics for best details, as seen in pics