Which is better for driving long screws and lag bolts?

The DCK277D2. Its impact driver is rated at 1,500 in-lbs, and the brushless motor holds speed under load. The DCK240C2 driver has no published torque figure and a brushed motor.

Is the DCK277D2 worth the extra $55?

Yes if you use the tools often. Brushless motors last longer, the driver is 0.8 lbs lighter, and the drill has more power. For occasional home jobs, the DCK240C2 at $129.00 does the work.

Which kit has more batteries?

The DCK240C2 clearly ships with two batteries and a charger. The DCK277D2 specs list two batteries, but its own box contents list one, so confirm before you buy.

The DCK277D2 should. Brushless motors have fewer wearing parts and run cooler. The DCK240C2 uses brushed motors, which wear out sooner with heavy use.

Can I use the same batteries on both?

Yes. Both are DeWalt 20V MAX tools, so batteries and chargers swap between them. The DCK277D2 also accepts FLEXVOLT batteries for longer runtime.

Which is better for tight spaces?

The DCK277D2. Its impact driver is 2.0 lbs and the drill is 7.6 inches front to back. The DCK240C2 driver is 2.8 lbs and 5.55 inches long, so it is shorter but heavier.

DeWalt 20V MAX Cordless 2-Tool Combo Kit with 2 Batteries and Charger vs DeWALT DCK277D2 20V MAX Cordless Brushless Drill / Impact Driver Combo Kit

Buy the DCK240C2 if you want the lowest price and a proven kit. It is $129.00 at Amazon as of November 4, 2026, versus $183.99 for the DCK277D2. The DCK277D2 is the better tool set: brushless motors, more torque, and a lighter impact driver. The $55 gap is real, so pick the DCK277D2 only if you will use the extra power and runtime.

Today the DeWalt 20V MAX Cordless 2-Tool Combo Kit with 2 Batteries and Charger costs $54.99 less at its best price.

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