Plastic thumb screw (M6 thread, 20 mm length)

Knurled-head plastic screw, 20 mm long, with an M6 thread.

This screw is suitable, for example, for securing the retractable tube section of the SkyWatcher Heritage Flex 130/650 Dobsonian, and can also be used as an adjustment screw for SkyWatcher 6x30 and 9x50 finder scopes.

It can be easily replaced if broken. The plastic screw will not damage metal surfaces.