Jandorf
1/8 ip x 1/4 ip, zinc, ceiling hickey, use to mount drop ceiling light fixtures, 1 end of the hickey screws onto the existing nipple at the outlet box, second nipple, which can be a different size ip, is screwed onto the other end of the hickey.
Cooper Lighting Halo HLBSL609FS5 Round 6" Slim c-Canless LED Downlights
Leviton 004-3152-8 Porcelain Keyless Screw Terminal Lampholder ~ 660w
Leviton 003-124-D Pigtail Type Incandescent Lampholder
Leviton 019-8101 Lamp Holder, Porcelain
Cooper Lighting HALO SMD6 LED 6" Round/Square Surface-Mount Downlights