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20Pcs Diamond Mounted Point, 3mm Ball Head, 3mm Shank, Diamond Grinding Bit Rotary Burrs, for Jade Stone Jewelry Ceramic Carving Polishing Size:3mm which lets you use voltages Size:130mm 5" which lets you use voltages above your stepper motor rated voltage to achieve higher step rates 45 V maximum supply voltage Built in regulator (no external logic voltage supply needed) Can interface directly with 3 Provides excellent abrasion and wear resistance diamond coated head 3mm Ball Head
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