The LH0752 Leviton 13661-OSL is a G13 medium bipin T8 or T12 LED or fluorescent lampholder / tombstone / socket. It is non-shunted and has a 23mm lamp axis. The Leviton 13661-OSL has flexible wings for a "push fit" mounting. It is also rotory locking which allows the lamp to be inserted then rotated to lock it into place.