If efficiency is a critical factor in tool selection, then you're going to love the speed that the Milwaukee M18 Fuel drives fasteners. This model also
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Milwaukee M18 FUEL 18V Lithium-Ion Brushless Cordless 1/4 in. Hex Impact Driver Kit with Two 5.0Ah Batteries Charger Hard Case 2853-22 - The Home Depot
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Milwaukee M18 Fuel 2953-20 (Gen 4) Impact Driver Review - DIY Gear Reviews
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Milwaukee M18 Fuel 2853-20 Review
Milwaukee M18 Fuel 2853-20 Review
BIG NUMBERS! Milwaukee Tool 2853 M18 FUEL Impact Driver Review
Milwaukee M18 FUEL 1/4 Hex Impact Driver - No Charger, No Battery, Bare Tool Only