Use this camera rail block to mount accessories onto your camera's support rods. This is a basic design with (2) 15mm holes 60mm on center. This is the standard spacing for all modern camera mounting accessories. Print this file, modify it and use it any way you wish to help you shoot better images.More information and other products that use this type of mounting accessories can be found on my website at http://www.habbycam.comRequires: Printed or machined part (2) standard 15mm camera rods of any length (6" rods shown) (1) 1/4-20 X 1.0" bolt (1) 1/4-20 NutAdd this thumb screw for easy tightening of the clamps: http://www.thingiverse.com/thing:11848