Makita HM1317CB 42 lb. AVT® Demolition Hammer, accepts 1‘1/8" Hex bitsMakita HM1317CB Makitas hard hitting HM1317CB 42 lb. Breaker Hammer is engineered for heavy chipping, demolition and breaking applications, but with less vibration for increased user comfort. The HM1317CB is equipped with Anti Vibration Technology (AVT), an internal counterbalance system that is engineered into the tool for more effective vibration reduction. It is an ideal solution for heavy structural demolition like breaking up driveways and