The innovative Crain 174 Carpet Repair Tool features four blades that cut a 3 1/8″ circle in carpet for making repairs. Fix burns, holes, stains, or any other defect.With the 4 blades only a small turn completes the cut achieving amazing results. Using carpet remnants, or carpet hidden under heavy furniture to fill the damaged area. Made from polished cast aluminum, this tool has a spring loaded depth pivot pin to make precise cuts.