Jandorf
1/8 ip x 1/8 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 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