Fotga DP3000 M2 15mm Rail Rod Baseplate for HDV DSLR Camera Follow Focus Rig Height Adjustable,Come with two 30cm length rods This Rail System has a central Tripod Mounting plate that makes a perfect balance between the camera and the front mount accessories (35mm dapter/Mattebox/Follow Focus) Strong enough to support the large variety of smaller cameras and bigger cameras as well Base stand bottom with 2 1/4" and 2 3/8" mounting holes, which will be helpful to put a whole heavy follow focus system on a tripod for stablizing and safety Top stand plate with a 1/4" and a 3/8" mounting holes. 1/4" bolt (compatible with most cameras) included on the top,and it is movable