QianLi DM800 Grinding Pen: New Arrival Guide
Shield removal, pad rework, and stripped-screw extraction used to mean bulky rotary tools that were hard to control on a phone board. The new QianLi DM800 Micro Self-Locking Grinding Pen — now in stock at Vexagoo — packs 16,000 RPM of precision grinding into a pen-sized body with a self-locking quick-change chuck. Here is what it can do on your bench and how to get the most out of it.
What Makes the DM800 Different
- Self-locking quick-change chuck — insert the head, spin the lock ring, and start working; concentric clamping keeps everything true with no wobble
- 5-speed digital control from stable low speed up to 16,000 RPM max, shown on a built-in display
- One-touch forward/reverse rotation with indicator lights (blue = forward, red = reverse)
- 2400 mAh battery for long non-stop sessions, recharged via Type-C
- High-efficiency motor with low vibration and low noise for steady precision work
- Pen-style body weighing just 116 g — balanced center of gravity and an anti-slip grip
Five Grinding Heads, Five Core Tasks
| Head | Best For |
|---|---|
| 0.8A | Pad drilling on motherboards |
| 4.0K | Shield cutting on mid-frames and shielding cans |
| 2.5A | Edge trimming and shaping |
| 2.0D | Hole drilling and rework |
| 1.5K | Stripped screw removal without board damage |
Where It Fits in Your Workflow
The DM800 covers three common scenarios: phone repair (shield cutting, pad rework, stripped screws), model and hardware polishing, and PCB precision repair and cleaning. Keep one charged at the bench for jobs that a screwdriver cannot handle — for example, when a screw head is rounded off and only careful grinding will free it. Pair it with the Screwdriver Bit Magnetizer Set to keep your everyday bits magnetized, and the iThor 2D precision screwdriver for standard disassembly.
DM800 at a Glance
| Spec | Value |
|---|---|
| Max Speed | 16,000 R/min (5-speed adjustable) |
| Battery | 2400 mAh, Type-C charging |
| Input Voltage | 5V |
| Rotation | Forward / reverse with indicator lights |
| Product Size | 24 × 24 × 167 mm |
| Net / Gross Weight | 116 g / 162 g |
| Package Contents | Polishing pen ×1, grinding heads ×5 |
Frequently Asked Questions
Q: What tasks is the DM800 used for?
Shield cutting, pad drilling, edge trimming, hole drilling, and fixing stripped screws on phone motherboards — plus model or hardware polishing and PCB precision cleaning.
Q: How do I change grinding heads?
Insert the head into the chuck, spin the lock ring to secure, and confirm stability. The self-locking design makes swaps one-step fast, with concentric clamping to prevent wobble.
Q: Does it support reverse rotation?
Yes. One-touch forward/reverse switching with indicator lights (blue = forward, red = reverse) is especially useful for loosening stripped screws.
Q: How long does the battery last?
The 2400 mAh battery supports extended non-stop operation and recharges conveniently via Type-C.
Q: Can I buy the DM800 in bulk from Vexagoo?
Yes. Vexagoo is an authorized distributor of QianLi and YCS repair tools, offering factory-direct wholesale pricing with no strict MOQ. Contact us on WhatsApp or by email.
Add the DM800 to your bench
The QianLi DM800 Micro Self-Locking Grinding Pen is in stock now at Vexagoo, an authorized QianLi and YCS distributor. For wholesale pricing, MOQ, and worldwide shipping, message us on WhatsApp or email isocket@qianli.cn.
Tools Mentioned in This Guide
QianLi DM800 Grinding Pen
The QianLi DM800 Micro Self-Locking Grinding Pen is a 5-speed cordless rotary tool for phone repair — self-locking quick-change chuck, up to 16,000 RPM, forward/reverse rotation, and five grinding heads for shield cutting, pad drilling, and stripped screw removal.
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QianLi Bit Magnetizer Set
The QianLi Screwdriver Bit Magnetizer Set restores lost magnetism on 4mm bits and color-codes them with 9 anti-slip silicone rings for instant identification during precision phone repair.
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QianLi iThor 2D Screwdriver
The QianLi iThor 2D Screwdriver series brings the classic iThor design to the starter tier with five precision bit styles (A/B/C/D/E). Featuring a durable 2D aluminum handle and the same high-quality S2 tool steel bits as the premium iThor family, this set is built for technicians who want trusted QianLi performance at a more accessible price. The smooth metal handle is easy to clean, comfortable for long repair sessions, and a practical choice for training centers, new repair shops, and bulk toolkits.
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