Loading... Please wait...A ratcheting single knob secures this block to any of our NATO rails to create quick release handles, EVF mounts, monitor mount and more. The quick release block has two tapped 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.