In a test by Todays Golfer, they found that dirty or shallow grooves can cause a 5.5% reduction in ball speed, a 53% reduction in backspin, and a 20% reduction in ball height. This stresses the need to keep your grooves clean. This sharpener allows you to get deep into your grooves restoring your clubs and prolonging their life. Simply run the sharp blade along your grooves with increasing pressure until you achieve the desired effect. Increase the lifespan and effectiveness of your clubs today by adding this much needed item to your bag.