Our 3 and 4.25 inch long NATO Rail and Clamp Block offers superior torsional strength for heavy loads. Create quick release handles, EVF mounts, monitor mount and more. The quick release Clamp Block has two 1/4-20 and two 10-32 tapped holes on the top to allow the addition of our handle mounts, 60 mm rail blocks or our 1/2-13 flange mount to allow you create a wide range of quick release mounts. The rail mounts to any plate with 1/4-20 tapped holes using the 1/4-20 fasteners included.