They are tested for -40° to +400° and are made of all stainless steel with two composite ends

103R has a gray plastic sealingring

It also has hidden screw holes and a spring loaded handle

For MX chair rotation

Basic Deck Rail - Two Rail,Top-mount,1000 mm Carry Case They are tested for -40°The Basic Deck Rail has a low height and an elegant design that does not take away from the existing deck. Comes with release handle that mounts on the chair and offers a concealed release cable inside the chair pedestal, which makes for a clean appearance (Note: Norsap 800 is not concealed and 1100 doesn't have chair mounted release handle). It is available in both a top mount and flush mount version. For harsher environments, the Standard Deck Rail