The Mirka AROP312-B 3" Angled Battery Polisher, 12mm orbit is a cordless random orbital polisher built for professional polishing work where control and freedom of movement matter. This is a cordless random orbital polisher designed for polishing and spot repair. Model Number: AROP312-B-NV. If you work in automotive refinishing, detailing, or small-area finish correction, this is the kind of compact polisher that makes sense when a full-size machine feels clumsy.

What sets this tool apart is the combination of a 3 inch backing pad and a 12 mm orbit. That setup is aimed at fast finishing on smaller sections, letting you work tighter areas without giving up the random orbital action that helps produce a refined finish. For spot repair, edge work, and localized correction, that smaller pad size gives you more control around curves and confined spaces than a larger polishing machine.

The cordless layout is a real advantage in a shop environment. You are not fighting a cord around fresh paint, trim, or adjacent panels, and you can move around the vehicle or workpiece without constantly managing slack. For pros who bounce between stalls, mobile work, or fast turnaround repairs, that convenience is not a small thing. It saves motion and helps reduce the chance of the cord getting in the way of the finish.

Mirka also built the AROP312-B to be light, nimble, and ergonomic. That matters because small polishers are often used one-handed, overhead, or in awkward positions where balance matters more than raw size. The angled body helps with access and hand position, while the variable speed trigger lets you adjust speed on the fly instead of stopping to reset your workflow. When you are blending a repaired section or working a tight contour, that kind of control is exactly what you want.

The brushless motor is another practical win. It helps keep maintenance lower than a brushed design and supports efficient operation for regular shop use. Supplementing that, Mirka calls out low noise performance, which can make a difference over a long day in a polishing bay or body shop where several tools may be running at once.

This version is the bare tool, not the full kit. Batteries and charger are not included with AROP312-B-NV. Mirka also sells a kit version under MUS-AROP312 that bundles the tool with two 5Ah 12V Li-ion batteries and a charger, so if you are already on the Mirka cordless platform, this bare-tool version is the logical way to add a dedicated small-area polisher without paying for power components you already own.

Who should buy it? Professionals doing spot repair, automotive finish work, detailing correction, and other polishing tasks where a large polisher is overkill. Serious users who want a compact battery polisher with a brushless motor, variable speed control, and a 3 inch working footprint will get the most out of it. If your day involves small panels, localized defects, and finish-sensitive work, this is a smart specialty tool.

A smart specialty polisher for finish-sensitive work

The Mirka AROP312-B 3" Angled Battery Polisher, 12mm orbit makes a lot of sense for pros who need more control than a full-size machine can give them.

• Who it's for: Detailers, paint correction pros, and body shop techs handling spot repair and small-panel polishing.
• Why it stands out: The 3 inch pad, 12 mm orbit, cordless design, and brushless motor make it purpose-built for precise finishing work.
• Worth knowing: This is the bare tool version, so plan on supplying the correct Mirka battery and charger if you are not already on that system.

• Is this a corded or cordless polisher? It is a cordless battery-powered random orbital polisher.
• What size backing pad does it use? It uses a 3 inch backing pad.
• What is the orbit size? The Mirka AROP312-B uses a 12 mm orbit.
• Does this version include a battery and charger? No. AROP312-B-NV is the tool-only version.
• Does it use a brushless motor? Yes, it is equipped with a brushless motor.