Iron material: Drill Bits Sharpener is made of iron material, which is strong and Sturdy and suitable for long term useAccurate grinding: Sharpening Machine grinding is accurate, ensuring the grinding angle of the drill bits is accurate and extending the service lifeSimple Using: Grinding Machine design is simple and easy to use, users can quickly get started and improve work efficiencyElectronic control motor: Portable Drill Bits Sharpener is equipped with an electronically controlled powerful DC motor with stable frequency and strong horsepowerTool box design: Angle Adjustable Drill Bits Sharpener adopts a tool box design, which is convenient for storage, management, and use Specification: Material: IronProduct speed: 5300RPMGrinding range: 90-145 Size Chart: Grinding diameter: 3-13mm/ 0.12inch- 0.51inch Package Includes: 1 Drill grinder set(US Plug) Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.