Jandorf
4", 1/4 ip, flat crossbar kit, with includes 3/8 ip x 1/4 ip hickey & 1/4 ip x 1/8 ip reducer & 2 each 8-32 x 1/2" mounting screws, use to mount light fixtures to the electrical junction box.
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