13" x 6" Safety Ramp Walking Right Groover 1" Spacing13" x 6" Safety Ramp Walking Right Groover 1" Spacing ideal for cutting grooves in sidewalk safety ramps where water drainage and traction are critical. The strong stainless steel blade creates a clean smooth cut with easy clean up. The right side ramp groover features a 1 4" x 1 4" groover bit is formed by a single piece of stainless steel for a completely smooth groove. The grooves are spaced 1" apart on the center to create traction on the surface.