FOR EFFICIENT AND QUIET SHREDDING. The robust roller shredder results in material being thoroughly and quietly shredded. It pulls in branches and twigs at just 40 revolutions per minute, meaning it works very thoroughly and quietly. Automatic backfeed ensures that jammed branches and other bulky cuttings are easily released. This allows you to work safely, efficiently and quietly with your garden shredder. Roller shredders are suitable for woody material, but not for soft green matter such as trimmings from perennials.