Barefoot International Boom Height AdjusterBarefoot International Boom Height Adjuster The Barefoot International Boom Height Adjuster uses quick release pins to raise or lower the user end of the boom up to 12 inches in either direction, making it easy to accommodate riders of different heights. Simply pin the square end into the boom clamp, then insert the boom end into the desired hole on the adjuster. Made from high quality aircraft grade materials for industry leading safety and