Multifunctional grinding screwdriver machine watch repair tools watch repair repair grinding one word non-marking screwdriver grinding machine 
Pre-purchase instructions 
About Color Difference 
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Multi-functional grinding screwdriver machine (one word/no trace) 
1.External dimensions:133X90X73(LxWxH)
2.Rated power:50w(powerful)
3.No-load speed:6000rpm(adjustable speed)
4.Bare machine weight:805g
5. Voltage: 12v (without power adapter, plug 220v use)
6. Grinding head clamping: 3mm (self-purchase collet clamping range 1-7mm)