Features: Specially designed for 4 hole 110BCD specification, ensuring perfectly fit. Make of aluminum alloy, it has superior corrosions resistance and impacts resistance. The unique locking design ensures a stable connection between the toothed disc and the crankshaft, effectively preventing detachment or loosening during intense cycling. Whether you prefer a single chainring setup or a double chainring setup, this adapter works for both configurations. This chainring crank adapter is specifically designed to fit for crankset, ensuring a seamless installation. Specifications: Component: Aluminum alloy Size: about 12x10cm/4.72x3.94inch cores Distance of the Hole: 11cm/4.33inch Color: Silver/Black Package Includes: 1pc Chainring Adapter note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.