Conquer concrete with Medusaw! The worlds first fully integrated worm drive saw designed specifically for scoring and cutting concrete accurately. We also have the Skil HD77 and the Skil Mag77, which has a magnesium housing, is a full two pounds lighter than aluminum models and has an upgraded 15 amp motor with high temp wire. This allows the user to work longer with less fatigue. Both Skil HD77 and Skil Mag77 are leaders in portable electric power saws. Both the Skil HD77 and Skil Mag77 circular saws are engineered to help do-it-yourselfers achieve home project success, while providing professionals durable, cost-conscience tools for the jobsite.