Shelf bracket -400mm long rail QR plate Highlights generic brand 400mm long rail QR plate Description: The sliding quick release plate for 400mm telephoto lens mount is a versatile rail compatible with the type Arca which allows you to mount a camera with a telephoto lens on a head. This takes the weight of the camera off the lens foot and provides an extra point of contact, which adds stability. The long channels allow you to precisely center the weight of the camera and lens on your head, ensuring your device isn't front or back heavy, adding even more stability. Three rotating parts allow you to adjust the range according to different cameras. Compatible with Acra-Swiss compatible heads. Support camera with battery. Supports a samera with telephoto lens. Specification: Material: Aluminum Alloy Long Rail Length: 400mm/15.7"" Width: 38mm Mounting Screws: 1/4"" and 3/8"" Compatible with: RRS/ARCA-SUISSE/KIRK/Wimberley/ MARKINS/SUNWAYFOTO/Kangrinpoche/BENRO/SIRUI Heads of AS Interfaces Package includes: 1 piece telephoto lens mount, 400mm Note: 1. The distance between the screw hole of the lens tripod mounting ring and the hole of screws from the bottom of the camera must be longer than 6.5cm to install this combination. 2. This combination does not support battery cameras, only devices without support.