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 Holders with 5/8" Pin
3" Aluminum Baby Pin with 1/4" Male Thread
3" Steel Baby Pin with 3/8" Male Thread
3" Aluminum Baby Pin with 3/8" Male Thread
