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BOSSMAN 20V LI - ION CORDLESS IMPAST DRIVER ( BIW - 919 ) MODEL : BIW-919 BATTERY VOLTAGE : 20V BATTERY TYPE : 4.0 AH MAX . CHUCK DIAMETER : 1/2'' MAX. TORQUE :300NM NO LOAD SPEED (R/MIN) : 0-2500 RPM IMPACT FREQUENCY : 0-3200 BPM