Simex RWA 500 wheel saw for skid steer loader - trenching for fiber optics Products:Wheel Saws (RW/RWA) Applications:Roadworks Added in Videos on 22/11/2018 The RWA 500 wheel saw is Simex's response to situations where the attachment is not able to work perfectly parallel to the ground. Also, the outlets for the material allow for a clean trench at the depth set without the need for a scraper.