Crack Chasers opens small cracks & allows for greater penetration of sealer and produces uniform edges in cracks. Crack chasers allows cracks to be filled with filler to roadway level or just below, keeping it below traffic & snowplow level. A crack chaser is used to widen a crack and roughen its edges so a filler or sealer can be placed & can be used on both asphalt. A crack chasers come in various sizes with different power options, including electric and gasoline-powered versions. They use a carbide-tipped cutter to accomplish the widening. A crack saw also widens the crack for sealing and uses a diamond blade as a cutting tool.