
DEWALT DCD799B
Score: 88/100
Flex 2-Tool Combo Kit
Score: 88/100Rankings

The DEWALT DCD799B is a bare-tool, 20V MAX* ATOMIC COMPACT SERIES brushless hammer drill designed for high performance in confined spaces. Its primary limitation is the lack of included batteries and charger, requiring users to invest in the 20V MAX ecosystem. It is best suited for professionals such as electricians and plumbers who need maximum power in tight areas.

The Flex FXM202-2B is a high-performance 24V brushless 2-tool combo kit featuring a hammer drill with Turbo mode and an impact driver. Its standout feature is the unrivaled power and speed, making it ideal for rigorous jobsite demands. It is best suited for professional contractors and framers requiring maximum torque and fastening capabilities.
| Attribute | ![]() | ![]() |
|---|---|---|
20 V | 24 Vbest | |
12.7 mmbest | 12.7 mmbest | |
28,050 BPM | 40,000 BPMbest | |
| ↓ lower better | 1.15 kgbest | 1.72 kg |
— | 1,400 in-lbsbest | |
1,650 RPM | 2,500 RPMbest | |
2best | 2best |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | ![]() | ![]() |
|---|---|---|
Power & Energy(1) | ||
Voltage (V) | 20 V | 24 V |
Ergonomics & Design(1) | ||
Weight (kg) | 1.15 kg | 1.72 kg |
Performance & Speed(2) | ||
Impact Rate (BPM) | 28050 BPM | 40000 BPM |
No-Load Speed (RPM) | 1650 RPM | 2500 RPM |
Features & Safety(1) | ||
Operating Modes | Drill/Hammer | Multi-Mode |


Products in the top-left offer the best value (high score, low price).

Professional reviewers, including Pro Tool Reviews, designate the DCD799B as the 'king of the Atomic drill line' due to its combination of highest power output (tested at 520-585 UWO) and compact 6.5-inch form factor. It is highly recommended for professionals who need hammer drill capabilities in a reduced-size profile.
Search results indicate a lack of direct consumer reviews, but common themes from product contexts highlight praise for its compact power and masonry performance in tight spaces. There are no recurring complaints noted in the available data, suggesting general satisfaction with its utility for confined area work.

Professional reviewers characterize the Flex FXM202 as a 'speed demon' capable of handling heavy-duty tasks with unrivaled power. They highlight the effectiveness of the Turbo mode and praise the robust 5-year warranty coverage.
There is insufficient data from everyday consumers, forums, or retail reviews to determine specific user sentiment, common praise, or recurring themes. Sales and rating data are limited to basic availability indicators.

