?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 and the loss will be relatively large.(Replaceable grindstone)! ! ! The hexagonal opposite (1/4) handle is suitable for use on various tools such as electric, manual, pneumatic screwdrivers, etc. Applicable drill size: 5/64 - 13/64 (2mm-5mm) 7/32 - 21/64 (5mm-8mm) + 11/32-1/2 (8mm-12.5mm), angle And width can be adjusted. the angle and width can be adjusted. Specification: Color: blue/orange Material: ABS + corundum grinding wheel Grinding wheel material: brown corundum grinding wheel Handle material: ABS Product size: 170*85mm(The size is shown in the picture) Package Includes: Only accessories or A set Note: The Drill bit Sharpener product itself includes a corundum grinding wheel and a spanner (as shown in the option diagram, if you do not know what accessories are included, you can check the picture of the option diagram) Thank you! It is suitable for grinding 2.0-12.5mm drill bits to play the role of grinding and repairing. 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. The best choice for novices and handymen After use, place in a dry and clean place. Do not use with harsh chemicals, it might reduce the lifetime. Drill bit grinding drill--product operation: 1. Install the grinder on the electric drill and lock the chuck 2. Hold the electric drill in one hand and the grinder in the other hand, use your thumb to gently push the drill bit 3. When working, the electric drill needs to rotate forward and the speed needs to be fast Note: Please allow 1-2mm error due to manual measurement. Thanks for your understanding. Monitors are not even calibers, the color of the item shown in photos may show slightly different from the actual item. Please take the real one as standard. After use, place the drill sharpener in a place that is out of reach of children to prevent sharp parts from harming children. Manufacturer Name:Bowen International GmbH Manufacturer Address:Jagdfeldring 72,Haar, Jagdfeldring, 85540,German Manufacturer E-mail:info.bowen@gmx.de