https://www.okw.com/en/Minitec/B9002706.htm?ref=41dae6b0-6960-11e5-b123-8eba63e66ed5
B9002706, Intermediate ring ES - OKW
B9002706 - Assembly unit: simply insert the intermediate ring between bottom and top part and screw the case together. ... Handheld enclosures - Read more
intermediateringesokw