Quik Lok SC/3525 Speaker mounting adapter

The Quik Lok SC/3525 adapter allows speakers with a 25 mm hole to be installed on standard 35 mm diameter tubing. The locking knob makes it possible to secure the speaker more securely and limit rotation on its own axis of the devices in use. The SC3525 adapter is made of steel.

They are part of the same series:

35 mm diameter adapter for speakers and lights with U-shaped bracket

38 mm diameter adapter for speakers with 35 mm hole

aluminum flange-bead, 35 mm diameter