Service:We attach great importance to our customers' shopping experience. If you have any questions, please feel free to contact us, we will reply you as soon as possible within 24 hours Quickly polishes drill bits in under 20 seconds, offering superior precision and performance compared to traditional hand methods. Automated design ensures easy operation, making it suitable for users with no prior experience.Designed for efficient performance without any customer service language. Features adjustable angles from 90 to 145 degrees with 0.02mm precision for sharp tips, along with a 180-degree rotatable grinding port for easy bit rotation. Available in 110V and 220V options with allowing chamfer size adjustments for bits ranging from 4mm to 20mm., Manufacturer: ZHJOPP