Clamping device for LED lamp for 42 mm diameter pipe

Simple clamping for LED lamps which has to be mounted on 42mm pipes.
It has two parts for better contact with pipe's surface.
I used PETG, 0.2mm leyer height.
Both parts have 4mm hole in which is possible to put heat inserts. I used M3 inserts and screws, but can be used M4 screws with nuts, without using heat inserts.

Red part is only for testing reason.