E27 to R7S lamp base adapter, r7s socket 1.250v 10A E27 holder, R7S base lamp 2.ceramic ... and OEM 250V E27 to R7S lamp base adapter, r7s socket lamp 1.Approved CE2.Fittings:aluminun,copper,iron,zinc alloy ... About US:1, We are the most professional switching lamp socket/holder manufacturer providing a wide range of switching lamp sockets ... outside measurement: 250V E27 to R7S lamp base adapter, r7s socket