Siemens Cam Locks come in a set of two. They are used to secure the alloy shield to the electron cone. Cam Locks can also be used to secure the acrylic drawing plates to the electron cone.

Item 894-420 would require sending your electron cone to RPD to have the Cam Locks mounted. Item 894-422 is the Cam Locks ONLY and customer would have to mount on electron cone.