berserker 1-9/16" sds-max heavy duty rotary hammer drill berserker 1700w 25-pound sds-max demolition jack hammer berserker 1300w 12-pound sds-max demolition jack hammer berserker 1700w 30-pound sds-hex demolition jack hammer berserker 10 berserker 13 berserker 11 berserker 1987 berserker 1-1/8 sds plus rotary hammer drill berserker 1-9/16" sds-max heavy duty