The MQ Mount is designed to securely hold T-12 LED fixtures with minimal or no light loss. The mount terminates to an industry standard 3/8" pin which can be used with any industry grip head. The 3/8" pin is knurled to prevent unwanted rotation and is internally tapped ¼"-20 to expand its length and rigging capabilities. – Patent Pending
Note: True T-12 is measured 1.5 in diameter. We are not responsible for those light tube manufacturers that have gone beyond spec of 1.5 in diameter.