Milwaukee
Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only)
$229
Best Angle Grinders · head-to-head
Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) vs Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)
A sourced, side-by-side comparison. Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) is cheaper at $49.97. Every spec and price links to its source.
Ryobi
Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)
$49.97Cheaper
Which is better: the Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) or Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)?
The Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) wins 1 of the 1 specs we compare head to head; the other wins 0. The Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) is the cheaper at $49.97. Get the Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) for the stronger spec sheet, the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) to spend less.
See Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) on Amazon Check Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) price
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) | Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) |
|---|---|---|
| US price | $229 | $49.97 |
| Brand | Milwaukee | Ryobi |
| Released | — | — |
| Disc size (in) | 5 in | 4.5 in |
| Power source | cordless | cordless |
| Amps or voltage | 18 V | 18 V |
| Max (rpm) | 8500 | 6500 |
| Brushless | Yes | No |
| Switch type | paddle | trigger |
| No volt release | — | — |
| Weight (lb) | 3.1 | 4.8 |
Sources — Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only): milwaukeetool.com (verified 2026-06-20). Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only): ryobitools.com (verified 2026-06-20).
What's the difference between the Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) and Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)?
Where the two actually differ on the specs we track (5 of 8). Matching specs are omitted.
- Disc size (in): Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) 5 in vs Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) 4.5 in
- Max (rpm): Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) 8500 vs Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) 6500
- Brushless: Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) true vs Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) false
- Switch type: Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) paddle vs Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) trigger
- Weight (lb): Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only) 3.1 vs Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) 4.8
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only)
Only one whitelisted tester, Pro Tool Reviews, covers the exact 2880-20, and only inside a Milwaukee lineup comparison rather than a standalone bench test. Editors endorse its runtime and safer paddle-switch design, but every performance figure (135 rebar cuts, 11A, 8,500 RPM, $199) is Milwaukee's own claim, not independently measured. (1 sourced review.)
Praised: Paddle switch gives a safer setup for shorter grinding and cutting bursts; Editors endorse the runtime (Milwaukee-claimed 135 cuts in 1/2-inch rebar per XC6.0 battery).
Flagged: Coverage is a lineup buying-guide, not a standalone bench test, so there is no independently measured performance for this exact model.
Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)
No sourced tester review yet.