Features1Compatible Models: ly compatible for Tongsheng electric bike mid drive 52T 104BCD motors, please confirm the motor model before use. 2 Material: This sprocket adapter is made of aluminum alloy, the hardness is much higher than the original steel sprocket, sturdy and durable. 3CNC Cutting: CNC cutting of aluminum alloy is used to ensure the accuracy of product use, and high accuracy ensures accurate adaptation. 4Chainring Conversion: This chainring adapter acts as a chainring conversion kit and can be used for repairs, replacements, maintenance and more. 5High Performance: This mid drive chainring spider has stable performance. After installation, it has the same performance as the original parts, and can be well adapted to electric bikes.SpecificationItem Type: Mid Drive Chainring AdapterShell Material: Aluminum AlloyGross Weight: 271g / 9.6ozBCD: Approx.104mm / 4.1inPackage List1 x 104BCD Chainring Conversion Kit