Process: Positive and negative tooth design, and high strength, CNC aluminum alloy chainring T6 heat treatment, Laser engraving treatment, high durability. Advantage: Upgrade aluminum alloy crank, High strength and high rigidity, Ultra-light aluminum alloy and strong steel teeth are optional, Forging process, No fear of rain, Easy to install, low-maintenance integrated design, One-piece stamping of high carbon steel Name: Square hole crank Suitable for bicycle type: mountain bike Suitable for bottom bracket: square hole Compatible: single sprocket Suitable for: 34T/36T disc Colour:Black Material:Aluminum Alloy Package Contents: 1x Bicycle Chainring hollow integrated crankset Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.