The Milwaukee 2889-20 M18 FUEL 4-1/2" / 5" Variable Speed Braking Grinder, Slide Switch Lock-On is a cordless angle grinder built for metal grinding and cutting with the freedom of the M18 battery platform. This is a cordless angle grinder designed for grinding and cutting metal. Model Number 2889-20. If you need a grinder that can replace a corded unit for day-to-day jobsite work, this one is built to do exactly that.

What matters here is the mix of power, control, and safety. Milwaukee rates it at 11 amp corded power, and the POWERSTATE brushless motor delivers a variable speed range from 3,500 to 8,500 RPM. That gives this angle grinder enough top-end speed for aggressive grinding and cutting, while the lower settings help when you need a steadier touch for more controlled surface work. It is not a one-speed grinder that forces the same behavior on every material.

The braking system is one of the features that makes this tool easier to live with on a real job. RAPIDSTOP stops most wheels in less than 2 seconds, which means less waiting around for the wheel to coast down after a cut. That matters when you are moving in and out of position, working off a lift, or setting the grinder down repeatedly during fabrication, rebar cutting, or clean-up passes.

Milwaukee also set this grinder up for faster changes and less downtime. Tool-free guard adjustment speeds up transitions between tasks, and the integrated FIXTEC nut design supports tool-free accessory changes. The slide switch lock-on layout is geared toward long grinding sessions where constant trigger pressure gets old fast. For users who spend time blending welds, cleaning up steel, or making repeated cuts, that switch style can be the better fit.

From a build standpoint, the metal housing and gearing are there for durability, and the removable dust screen helps protect the internals from dust and metal debris. That is the kind of detail that matters with grinders because fine debris is exactly what shortens tool life over time. REDLINK PLUS electronics also manage communication between the tool and battery for performance and overload protection, which is a big deal when you are leaning on the tool hard.

On the platform side, this Milwaukee grinder is compatible with all M18 batteries. Milwaukee specifically calls out the M18 REDLITHIUM HIGH OUTPUT XC6.0 pack for stronger output and cooler operation, but this is still part of the broader M18 system, so if you are already invested in Milwaukee cordless tools, dropping this into your lineup is easy. Just note that this SKU is the bare tool, so the battery and charger are not included.

Who should buy it? Metal fabricators, welders, mechanical trades, general contractors, and serious DIY users who want a cordless grinder that does more than light-duty cleanup. If your work includes cutting rebar, grinding welds, trimming bolts, or general metal prep, the Milwaukee 2889-20 M18 FUEL 4-1/2" / 5" Variable Speed Braking Grinder, Slide Switch Lock-On is the kind of tool that earns its place fast. It is especially compelling for M18 users who want corded-like grinder performance without the cord management headache.

One of the better cordless grinder setups for guys who actually lean on a grinder

The Milwaukee 2889-20 M18 FUEL 4-1/2" / 5" Variable Speed Braking Grinder, Slide Switch Lock-On gives you the power people want from corded grinders, plus the control and fast braking that make cordless worth owning.

• Who it's for: M18 users doing regular metal cutting, weld cleanup, rebar work, and general fabrication who want a serious cordless angle grinder instead of a light-duty backup tool.
• Why it stands out: The wide 3,500 to 8,500 RPM range, RAPIDSTOP brake, slide switch lock-on setup, and tool-free adjustments make it more useful across different grinder jobs than a basic single-speed model.
• Worth knowing: This is a bare tool, so plan on supplying your own M18 battery and charger. If you already run M18, that is no big deal. If you do not, factor that into the real buy-in.

• Is this a bare tool or a kit? This SKU is a bare tool. Battery and charger are not included.
• What batteries does it use? It is part of the Milwaukee M18 platform and is compatible with all M18 batteries.
• What is the speed range? The grinder has 5 speed settings with a no-load speed range of 3,500 to 8,500 RPM.
• What wheel sizes does it support? It is designed for 4-1/2 inch and 5 inch wheels.