Which is better for removing rusted lug nuts?

The DCF900B. Its 1,400 ft-lbs breakaway torque beats the DCF891B's 800 ft-lbs, and it costs less at $87.99 at eBay as of November 3, 2026.

Which is better for tight engine bay work?

The DCF891B. It is under 4 lbs and 8 inches long, so it fits where the larger high-torque DCF900B will not.

Is the DCF900B worth the extra over the DCF891B?

It is not extra: it is cheaper. At $87.99 at eBay versus $160.39 at Amazon as of November 3, 2026, the DCF900B gives more torque for less money.

Do either include a battery?

No. Both are bare tools. You need a DeWalt 20V MAX battery and charger, sold separately.

Which is faster at driving lag bolts?

The DCF891B spins faster at 2,000 RPM and 3,150 IPM versus 2,300 RPM and 2,500 IPM, but the DCF900B has far more torque for large fasteners.

Both use brushless motors. The DCF900B adds BATTERYGUARD to absorb shock at the battery connection, which helps under heavy repeated use.

DeWalt DCF891B 20V Cordless 1/2" Impact Wrench (Tool Only) vs DeWalt 20V MAX XR High Torque Impact Wrench with Hog Ring Anvil dcf900b

Buy the DCF900B if you need maximum power: it delivers 1,030 ft-lbs fastening and 1,400 ft-lbs breakaway, and at $87.99 at eBay as of November 3, 2026 it costs far less than the DCF891B at $160.39 at Amazon. The DCF891B is the lighter, more compact mid-torque option at under 4 lbs with 600 ft-lbs fastening and 800 ft-lbs breakaway, better for tight spaces and lighter jobs. For heavy suspension, lug nuts and anchor bolts, the DCF900B wins on both torque and price.

Today the DeWalt 20V MAX XR High Torque Impact Wrench with Hog Ring Anvil dcf900b costs $87.00 less at its best price.

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