The Hum-B Edge Grinder is the only surface grinder equipped with the patented dust grabber dustless shroud. The Dust Grabber allows the Hum-B to float across the surface without creating suction lock to slow you down. The Dust Grabber eliminates 100% of suction lock, captures 99% of airborne dust, and cuts shroud replacement cost by 75%. The replaceable polymer seals are quick and easy to replace and do not require the diamond wheel or shroud to be removed. In less than a minute the seal is replaced and your back on the job.