CY4-SHC for Shimano 11speed Installation guide

CY4-SHC is ultra-light, super-small non-circular inner ring exclusively designed for Shimano 11speed cranks.
Before installation, make sure that your Shimano crank is one of the compatible cranks in the list.
FC-RS510 which is 11speed crankset with equivalent features to 105 is not compatible with CY4-SHC. Model information is shown above or surrounding the area on the backside of the pedal threads.