40W Mini Rotary Grinder Tool – Fits Makita 18V-21V Battery

40W Mini Rechargeable Rotary Grinder – Compatible with Makita 18V–21V Batteries

Take your DIY projects and fine detail work to the next level with this powerful yet compact 40W Mini Electric Rotary Grinder. Engineered from high-quality aluminum alloy, this handheld rotary tool offers stepless forward and reverse speed control, reaching up to 18,000 RPM no-load — giving you precise command over every cut, grind, polish, or engrave. Designed to work with standard Makita 18V–21V lithium batteries (battery not included), it's a versatile and portable workshop companion.

Made in Mainland China.

Why You'll Love This Rotary Tool

• Premium Aluminum Alloy Body — Lightweight yet durable construction built to handle demanding detail work without weighing you down.
• Stepless Speed Regulation — Smoothly adjust speed from low to high (up to 18,000 RPM) in both forward and reverse directions for complete versatility.
• Ergonomic Pen-Shaped Design — Slim, comfortable grip fits naturally in your hand like a pen, reducing hand fatigue during extended use.
• Wide Chuck Clamping Range — Accepts bits and accessories from 0.4mm to 3.2mm, compatible with a broad range of grinding, cutting, and polishing attachments.
• Long Battery Runtime — With a 3.0Ah Makita battery, enjoy up to 11–12 hours of idle run time at max speed; 5–6 hours with a 1.5Ah battery.
• Multi-Purpose Applications — Ideal for grinding, polishing, engraving, cutting, pet nail grooming, model making, jewelry crafting, and more.
• Comprehensive Accessory Kit — Everything you need to get started right out of the box, stored neatly in an included storage box.

Specifications

What's in the Box

• 1 × Rechargeable Lithium Electric Rotary Grinder
• 1 × Sandwich Shaft
• 1 × Speed Regulator
• 2 × Wrenches
• 1 × Rubber Wheel
• 1 × Tapping Rod
• 1 × Circular Saw Blade
• 2 × Diamond Grinding Needles
• 2 × Wool Polishing Wheels
• 3 × Sandpaper Rings
• 3 × Twist Drill Bits (0.5 / 1.0 / 1.5mm)
• 5 × Grinding Wheel Heads
• 1 × Storage Box
• 1 × User Manual

Note: Battery is NOT included. Compatible with Makita 18V–21V lithium batteries. Minor color variations may occur due to lighting and screen settings. Please allow ±1–3 cm measurement tolerance.

For more information on safe power tool operation and workshop safety best practices, visit OSHA's Hand and Power Tools Safety Guide.

Frequently Asked Questions

Q: Is a battery included with this electric rotary grinder?

A: No, the battery is not included. This rotary grinder is compatible with standard Makita 18V–21V lithium-ion batteries, which are sold separately. This makes it a great addition to any existing Makita battery tool collection.

Q: What can I use this mini electric grinder for?

A: This versatile 40W rotary tool is suitable for a wide range of tasks including grinding, polishing, engraving, cutting, and drilling. It's also great for fine detail work such as jewelry crafting, model making, and pet nail grooming. The comprehensive accessory kit means you're ready for multiple applications right away.

Q: How do I adjust the speed on this rotary tool?

A: The included speed regulator allows stepless (continuous) speed adjustment, so you can dial in exactly the right RPM for your task — from slow and controlled for delicate engraving to full 18,000 RPM for aggressive grinding. Both forward and reverse rotation directions are supported.

Q: What size bits and accessories does this grinder accept?

A: The chuck accepts bits and accessories with shank diameters ranging from 0.4mm to 3.2mm, making it compatible with most standard rotary tool accessories and the full accessory set included in the box.