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Ryobi P421 6500 RPM 4 1/2 Inch 18 Volt One Lithium Ion Angle Grinder Review

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By Best Choice team
Checked icon Last updated - March 26, 2026
9.6

Verdict overview

  • worth the money 9.3
  • Simple to use 9.9
  • Long life 9.9
  • Battery Duration 9.1
Pros
  • Adjustability: 3 positions, 90 degree rotation.
  • On board wrench: Swap grinder discs.
  • Grinding wheel: Type 27 for metal/home.
Cons
  • Limited power/speed.

Tech specs

product dimensions 12L x 8W x 8H
color Green
item weight 4.8 pounds
special features variable-speed, lightweight
batteries included No
voltage 18 Volts
maximum rotational speed 6500 RPM
item package quantity 1
material Alloy Steel, Plastic
power source electric, Battery Powered
style Rpm,Adjustable,Box,Adjustable Side
batteries required No
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Product Overview

The RYOBI P421 6500 RPM 4 1/2 Inch 18 Volt One Lithium Ion Angle Grinder is a great tool for any home improvement or metalworking project. It has a powerful motor that can reach up to 6500 RPM, and the adjustable side handle works in three different positions so you can fit this tool almost anywhere you would need to grind. Additionally, it comes with an onboard pin wrench to easily replace grinder discs, and the rubberized notched grip near the trigger allows you to handle this tool in most conditions with grease or oil on your hands.

This angle grinder is perfect for both professional and DIY projects. Its compact size makes it easy to store and transport, while its high power output means that it can tackle tough jobs. The included grinding wheel is designed for metalworking and home improvement tasks, making this an excellent all around tool for your workshop. Additionally, it is compatible with Ryobi batteries from the One Lithium Ion series as well as older NiCad models. This makes it an incredibly versatile tool that can be used with a wide range of batteries.

In terms of performance, this angle grinder definitely lives up to expectations. It has a powerful motor that runs smooth and quiet, so you won t have to worry about any annoying vibrations or noises when using it. The trigger grip rotates 90 degrees which allows you to access hard to reach areas without having to reposition the tool. Furthermore, the adjustable side handle provides additional control over the grinding process and provides extra stability while working on large surfaces.

In terms of design, this angle grinder looks very sleek and modern. The green color scheme gives it a professional look that will fit in nicely with other tools in your workshop. The plastic body feels sturdy enough to handle regular use without any signs of wear and tear, while the alloy steel construction ensures that this tool will last for years to come without any issues.

Overall, the RYOBI P421 6500 RPM 4 1/2 Inch 18 Volt One Lithium Ion Angle Grinder is an excellent choice for any home improvement or metalworking project. It has a powerful motor that runs smoothly and quietly, adjustable side handle for additional control, onboard pin wrench for easy grinding disc replacement, and rubberized notched grip near the trigger for comfortable handling in most conditions with grease or oil on your hands. Its versatile compatibility with different types of Ryobi batteries makes it an ideal choice for anyone looking for a reliable angle grinder at an affordable price point.

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Frequently asked questions

  • What materials can I use this tool on?Arrow icon
  • How easy is it to use?Arrow icon
  • Is a battery included?Arrow icon
  • What is the maximum rotational speed?Arrow icon
  • Is a grinding wheel included?Arrow icon

The secret behind our reviews

By Best Choice team

Best Choice Team is your go-to source for curated product recommendations across various categories. Leveraging years of industry experience and advanced AI technology, we analyze data from multiple sources to bring you the most relevant and up-to-date product lists.

Our AI-driven approach allows us to streamline the selection process, ensuring that the products we feature align with current market trends and consumer preferences. We aim to provide content that helps you navigate your purchasing decisions with greater ease.

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96% of reviewers would recommend to a friend, Based on 1,764 Reviews

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