The LH1161 MD38-630L is an R17d recessed double contact socket / tombstone / lampholder for LED or HO / VHO fluorescent tubular lamps. This is a direct replacement for the discontinued Kulka 530-1K sign socket.. It is a snapin mounting commonly used in signs or freezer cases. The LH1161 MD38-630L has an "O" ring to keep moisture away from the contacts. This is the spring loaded end that matches to the LH1162 which is a direct replacement for the Kulka 530.2K. The MD38-630L is similar or equal to the Kulka 530-1K, Etlin Daniels FL630-L and the Sympan MD38-630L.