Description: Material: Made of 7075 aluminum alloy, CNC cutting, corrosion resistance, with positive and negative teeth designed to prevent the chain from dropping, strong bite force. Specifications: 50T 52T 54T 56T 58T 60T, crank BCD (to-hole distance) is 110 mm. Mud discharge oblique mouth to prevent sediment accumulation. The thickness of each tooth is processed by CNC, which can work seamlessly with the inner and outer links of the chain to suit your riding, and reduces friction and noise. The anode is colored to prevent oxidation, so that an oxide film can be formed on the aluminum surface, which effectively protects the aluminum alloy body. Anti-corrosion and anti-rust, no fading. Suitable for most 110 BCD cranks, please make sure your crank BCD and number of tooth specification carefully before purchasing. Specification: Material: 7075 Aluminum Alloy Size Chart: Teeth: 50T/52T/54T/56T/58T/60T Crank BCD (to-hole distance) : 110mm/4.33inch Package Includes: 1 Piece 110BCD Narrow Wide Chainring