Unbelievable Gripping Power with Green-GRIP Green-GRIP is the proprietary non-slip material that gives you superior gripping power over workpieces and materials such as oak, cherry, walnut, ebony, pine, poplar, maple, plastics, and aluminum. Treaded grooves provide increased traction on the workpiece even with sawdust. With the included Adjustable Spacer, you�ll get 54% more gripping area for your biggest projects (compared to the GRR-RIPPER GR-100). Easily cleaned with denatured or rubbing alcohol. No other push block�s grip comes close. Superior Safety The GRR-RIPPER is engineered to be a Moving-Blade-Guard shielding your hand throughout the cut. It�s unique design creates a Saw-Blade-Tunnel for the table saw blade to pass through while your hands are safe from contact. Downward pressure prevents the workpiece from lifting off the table saw top or kicking back. Inward Pressure guides the workpiece along the fence substantially reducing burn and improving cut quality. The included Stabilizing Plate keeps the stock against the fence without binding, and also provide 250% more stabilizing surface area (when compared to the GRR-RIPPER GR-100). More control gives you safer, smoother, and smarter cuts. Enough hardware to outfit two GRR-RIPPERs. Includes 5 Heels, 2 Heel Spacers and mounting hardware, enough for outfitting 2 GRR-RIPPERs. Adjustable up to 1�. Replacement Heels available. For use with table saws, bandsaws, jointers and router tables.