The Milwaukee 2719-21 M18 FUEL HACKZALL is the fastest cutting and most powerful one handed reciprocating saw. Utilizing a POWERSTATE_ brushless motor and a best in class 7/8 in stroke length, the M18 FUEL HACKZALL cuts up to 50% faster than competitors. The compact, one handed design provides superior control and the ability to make cuts in tight spaces. The dual gear counter balance mechanism provides up to 4x lower vibration than traditional reciprocating saws, resulting in faster cut starts in metal and reduced user fatigue. REDLINK PLUS intelligence ensures optimized performance and protects your investment from overload, overheating, and over discharge. The M18 REDLITHIUM XC5.0 battery pack provides more work per charge and more work over the life of the pack than competitive batteries. A rubber seal and weep holes provide superior protection against water and debris.