Industry standard mitchell thread. Aluminum. Center hole is 1" (used with chapman 1" bolt).
Combination Camera Rod Starter (5/8" to 5/8")
Fluorescent T12 Lamp Holder with 5/8" Pin
Fluorescent T12 Lamp Holder with 5/8" Pin and Rubber Clips
Dual Fluorescent T12 Lamp Holder with 5/8" Pin and Rubber Clips
Dual Fluorescent T12 Lamp Holder with 5/8" Pin
