1,High Compatibility: Standard 4 plate hole BCD 104MM installation specification, suitable for a variety of 4 jaw mountain cranks. 2,Durable Material: Lightweight all aluminum alloy forging, strong impact resistance, anodized surface, and good anti rust effect. 3,Mud Discharge Oblique Mouth: Prevent the accumulation of mud and sand, and the transmission runs smoothly. 4,Arc Cut In Angle: Positive and negative tooth positioning groove, strong bite force, lighten the burden of the vehicle. 5,Wide and Narrow Tooth Design: Reduce the chain wear, the chain and the gear are closely attached, not easy to drop the chain, and efficient transmission. Item Type: Narrow Wide Chainring Material: Aluminum Alloy Number of Teeth: 32T Weight: Approx.58g or 2.0oz Size: Outer Diameter: Approx. 135mm or 5.3in, Distance Between Adjacent Hole Centers: Approx. 74mm or 2.9in, Distance to Center of Hole BCD: Approx. 104mm or 4.1in, Inner Diameter: Approx. 88mm or 3.5in, Installation Inner Hole Diameter: Approx. 10mm or 0.4in, Thickness: Approx. 4mm or 0.2in 1 x Narrow Wide Chainring Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.