This Sullivan’s Staggered Roto Brush has rows of bristles with staggered lengths, one row long, the next row being 1/4” shorter. The short-cut rows allow the long bristles to work deeper into the hair. This creates more lift and volume to the hair, prevents a matted look and invigorates stimulation to the hair base for new hair growth and faster hair training. The soft, gentle grade of synthetic bristles prevents the brush from being too harsh on your animal's hide. A lock nut and flat-sided bolt prevent the brush from spinning loose in the drill.