Go to: www.TrainingSweeps.com for more information. Plyo-Box Sweeps create a "fail-safe" edge for any athlete attempting new vertical jump heights. If an athlete successfully jumps to 18" but is uncertain of their 24" ability they can load a 6" sweep on an 18" box. If they clears the 6" sweep then they have had a successful 24" jump. If they touch the brush they still land safely on the 18" platform without incident. Prevent injury to shins and chins with this simple approach. Sweep fixture attaches to most metal and wood plyo-boxes with magnets or self-tapping screws. Two height brushes - 6" and 11". Height may vary slightly with placement of fixture.