Description: HIGH STRENGTH & LIGHT WEIGHT:Material is steel, light weight but high strength NARROW WIDE TOOTH:The narrow wide tooth design, increasing the contact area with the chain greatly, so that each of the teeth can be fully inserted into the chain, increase the grasp force, make you no longer worried about the chain dorpped, easy to pass through the bumpy road. SINGLE CHAINRING:Through the modification single speed chainrings, reduced the transmission system greatly ,completely abandoned the complex variable speed system,reduce the bike weight at least 1kg, looks more compact and simple, and also greatly improve your speed. CNC PRECISION PROCESS:CNC precision machining and anodic oxidation electroplating, keep medals smooth surface, bright color, not faded and corrosion resistance. FOR ALL KINDS OF 104BCD CRANKS:This speed chainring slice disc screw nail with no sink design can be using for the original screw directly , no need to spend extra money to buy the screw. This single chainring be used for ALL KINDS OF 104BCD cranks. Specification: Material: Steel Hole Diameter: 10mm / 0.39inch Tooth: 48T BCD: 104mm Package Includes: 1 Piece 104 BCD Chainring Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!