This sockets are made from porcelain and work with MR16 lamps along with many other bi-pin lamps, including G4, G6.35, GY6.35, GX5.3 MR16, GZ4 ,MR11 porcelain lampholders.
Replacement ceramic low voltage MR16 lamp holder with tails. Commonly used in low voltage down lights, this replacement is ideal. Simply connects to your transformer, so you can replace a damaged lamp holder easily.