Portable Adjust Angle Drill Bit Grinder,Drill Holder,Twist Drill Bit Grinder,Multipurpose Drill Bit Grinding Sharpener It features an industrial-strength diamond sharpening wheel that maintains its shape over time. The cool design prevents drill bits from heating up and losing their tempering during sharpening. The drill sharpener is constructed with a nylon shell, which offers good fatigue resistance and excellent insulation properties. Extend Bit Life through Sharpening Color: As Shown Material: Plastic+Metal Package Contents: 1set Drill Bit Grinding Sharpener Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.