Leofoto’s FDM-03 is a universal accessory rail kit with two mounting systems. This product is designed for rifle sport users to mount optics and telemetry equipment, but it can be used for a wide variety of industries and applications. The only difference between the FDM-03 and FDM-04 is the length of the included rails. The FDM-03 has a 320mm rail, whereas the FDM-04 has a 450mm rail.
 
FDM-03 Specifications
Length: 320mm
Weight: 600g
Width: 38mm
Included in this kit
BPL-320 Double Arca Profile Rail – This rail/plate (320mm) features a double Arca profile, which allows the user to position multiple mounting options at any position. The bottom profile allows the rail to be moved to any position in an Arca clamp to suit a variety of installed equipment. A large top-mounted spirit level allows quick and easy levelling of the rail for level panning and accurate measurements. 
LH-22 Ball Head – This ball head allows one of the installed items to be manoeuvred independently of the rail. This is ideal for training a spotting scope on a target. Note that this is not a standard LH-22 – it is permanently mounted to an Arca clamp, which allows it to be attached to the rail. A small mounting plate is included with the head.
DDC-38 Double Arca Clamp – This is a dual Arca clamp system that allows one of the installed items to be mounted parallel or perpendicular to the rail.
NP-60S Quick Release Plate – A high quality Arca-Swiss quick release plate (66mm) used to mount your camera or accessories via a 1/4" tripod screw.