[help] What type is this device?

It is quite impossible to distinguish the device close to the 2 trimmer capacitor
The picture is not so clear

trimmer capacitor, or other name,variable capactor, use to adjut the match condition of the corner

if you mean the trimmer capacitor: you can find it in Temex and as it seems to have a red colour dot it is a 0.6-2.5pF
bye