The LH0289 MD38 is an R17d (recessed double contact) slide on or push-fit mounted, T8/T12 HO, VHO, 800ma, 1500ma or LED lamp holder/socket. The T8/T12 R17d (recessed double contact) fluorescent or LED lamp holder is the stationary (female) half of the socket pair needed for the LED or fluorescent tubular lamp. The LH0289 MD38 is a tombstone socket It is rated up to 660W-600V, is cULus and CSA certified. The LH0289 MD38 has has “quick connects” for easy wire connections. It is made of durable polycarbonate.