Features PVC conveyor belts. Manual operation. SM-520F:with handle. SM-5208:with push button. Speed 50 cm/sec. Shifting speed by Ratchet Wheel Commutator and Chain Wheel wearswell. Tables can be raised after operation. The safety grid can protect us from injury. Remove scrapers without tools conveniently for cleaning. SM-520F:Mounted on castors with locking system, easily movable.