Grinding wheel currently used in the product is a brown corundum grinding wheel, so the product is mainly used for grinding iron drills. Other high hardness drills are not suitable for use, and the loss will be relatively large. Product Features: Use electric drill with mandrel to drive this tool. Sharpen bits and improve your work performance. Grinding wheel made of wear resistant corundum. Good sharpening effect, saving a lot of effort. Light weight and compact size, easy to load. Product Specification: Color: Blue with 1 Wheel or Red with 1 Wheel Material: ABS and corundum grinding wheel Grinding wheel material: brown corundum grinding wheel Handle material: ABS Product size: 180x40x32mm Package Includes: 1 x Twist Drill Grinder 1 x Wrench other accessory Professional Services In our store, if you have any doubts about our products, please feel free to . After you receive the product, if you have any question about the use of methods and product performance, we will provide you with professional, caring sales service. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.