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.
Key Specifications
- Brand
- QianLi
- Model
- DM800 Micro Self-Locking Grinding Pen
- Input Voltage
- 5V
- Charging Port
- Type-C
- Speed
- 16,000 R/min Max, 5-Speed Adjustable
- Rotation
- Forward / Reverse with Indicator Lights
- Battery Capacity
- 2400 mAh
- Chuck
- Self-Locking Quick-Change, Concentric Clamping
- Product Size
- 24 × 24 × 167 mm
- Net / Gross Weight
- 116 g / 162 g
- Package Contents
- Polishing Pen ×1, Grinding Heads ×5
Product Overview
Key Features
- Self-locking quick-change chuck — spin to lock, swap heads in one step
- Concentric clamping keeps the head true with no deviation in precision work
- 5-speed digital control from stable low speed up to 16,000 RPM max
- One-touch forward/reverse rotation (blue = forward, red = reverse)
- Five standard grinding heads included: 0.8A pad drilling, 4.0K shield cutting, 2.5A edge trimming, 2.0D hole drilling, 1.5K stripped screw fix
- High-efficiency motor delivers stable output with low vibration and low noise
- 2400 mAh battery supports long non-stop operation, recharges via Type-C
- Pen-style body at 116 g — lightweight, balanced center of gravity, anti-slip grip
Application Scenarios
- Cutting phone mid-frame shields and shielding cans during board repair
- Drilling and reworking pads and holes on motherboards
- Removing stripped screws without damaging the surrounding board
- Polishing model parts, hardware, and small metal components
- PCB precision repair and cleaning in professional repair shops
Frequently Asked Questions
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.
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.
How long does the battery last?
The 2400 mAh battery supports extended non-stop operation and recharges conveniently via Type-C.
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.
Which grinding heads are included?
Five standard heads: 0.8A (pad drilling), 4.0K (shield cutting), 2.5A (edge trimming), 2.0D (hole drilling), and 1.5K (stripped screw fix).
Do you offer wholesale pricing?
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.
More questions? Browse the completeHand Tools FAQ →
Need Bulk Pricing or Custom Order?
As an authorized distributor of QianLi, Mega Idea and YCS, Vexagoo offers factory-direct wholesale pricing with global shipping. No minimum order required.
Related Products
QianLi H400 Soldering Station
The QianLi H400 is an upgraded digital soldering station with finer temperature control and faster response than the H240. T12/T245 tip compatible, it is built for daily micro-soldering, BGA rework, and motherboard IC work in professional repair shops.
View Details →
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.
View Details →
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.
View Details →Related Repair Guides
QianLi DM800 Grinding Pen: New Arrival Guide
The QianLi DM800 Micro Self-Locking Grinding Pen has arrived at Vexagoo — 5-speed control up to 16,000 RPM, a self-locking quick-change chuck, forward/reverse rotation, and five grinding heads for shield cutting, pad drilling, and stripped screw repair.
Read Guide →
Precision Screwdriver Set for Phone Repair: The Complete 2026 Buying Guide
The complete 2026 buying guide to precision screwdrivers for phone repair — 2D vs 3D grip, bit types, and our 8-model Vexagoo lineup compared.
Read Guide →