Rotamaster 4000 gives rotary blades balanced, consistently edges that produce a sharp cut for better-looking grass. Uses clamp mechanism and fast-aligning jib bars to mount blades and ensure that both ends are sharpened equally and with automated precision. Ergonomic height makes self-contained unit easy to use. Grinding wheel is located in enclosed, hands-free area for safe operation while integrated vacuum sucks away sparks and dust. Also features storage space for extra rotary blades.