Quik Lok SC/3835 Adapter for mounting speakers

The Quik Lok SC/3835 adapter allows speakers with a standard 35 mm hole to be installed on 38 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 SC3835 adapter is made of steel.

They are part of the same series:

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

35 mm diameter adapter for speakers with 25 mm hole

aluminum flange-bead, 35 mm diameter