Which is better for cutting rebar?

They share the same motor and wheel range, so either works. DeWalt rates the DCG407B at up to 56 cuts of 1/2 in rebar per charge. Its lock-on switch helps on repeated cuts.

Both have Kickback Brake and E-Clutch. The DCG408B paddle switch cuts power the moment you release it, which many users prefer for dead-man control. The DCG407B adds an electronic brake.

Is the DCG407B worth the $2 savings?

Only if you want a slide switch with lock-on. Otherwise the $2 gap is too small to decide on, and the DCG408B has the far larger review base.

Do they use the same batteries?

Yes, both run on DeWalt 20V MAX packs and ship as bare tools. The DCG408B also accepts FlexVolt batteries.

Both use brushless motors with mesh screens on the 408B to keep debris out. There is no long-term data yet, and the 407B has just one rating.

What comes in the box?

Bare tool only for both. The DCG408B includes Type A and Type B guards for OSHA 62841 compliance, but reviewers say no spanner wrench is included.

DeWalt 20V MAX dcg408b Brushless Cordless Paddle-Switch Grinder vs DEWALT DCG407B 20V MAX XR Brushless Cordless 4-1/2"–5" Angle Grinder with Kickback Brake and E-Clutch, Tool Only

These are near-twins: both are 20V MAX brushless 4-1/2 to 5 in grinders with 850 MWO, 9,000 RPM and the same Kickback Brake and E-Clutch safety electronics. The real split is the switch: the DCG408B has a paddle switch, the DCG407B a slide switch with lock-on. As of November 5, 2026 the DCG407B is $115.00 at eBay and the DCG408B is $117.13 at Walmart, so the price gap is about $2. Pick on switch style and grip, not on power.

Today the DEWALT DCG407B 20V MAX XR Brushless Cordless 4-1/2"–5" Angle Grinder with Kickback Brake and E-Clutch, Tool Only costs $2.13 less at its best price.

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