Repair Kit, set of (2) replacement cartridges, for K-1, K-11, K-50, K-51, K-52, K-53, K-56, K-101, K-124, K-160, K-208 & K-240, fits faucets supplied after November 2015, hot & cold color rings do not have exposed screw head, if you have a faucet with exposed screw heads (supplied until mid 2016), order K-00 instead of K-00B