This Double Clip Kit is another variation of the Flare Buster system. It has spring-clips on both ends, and instead of clamping into the camera's hot shoe it can be clipped onto any extensions or protrusion.
The FlareBuster system is a handy accessory that shields your lens from image-degrading stray light without the need for large lens hoods or for shielding the lens with a hat or your hand. It stores in a very compact fashion and can universally shade all but the biggest of telephoto lenses quite effectively.