Fangrui Product Details Various Shapes And Sizes To Fit Different Needs - This Sanding Bits Comes In Three Different Shapes And Sizes, All With A 1/8 Inch Shank To Fit Standard Rotary Tools. Such As Curved, Flat And Slotted Surfaces. Ideal For Sanding After Beveling Holes In Metal And Wood. More Durable - Made With Metal Oxide, A High-quality Industrial Abrasive Made For Extended Use, Making This Bits Tough Enough To Smooth Out Most Materials Including Stainless Steel. It Has Plenty Of Shank For The Collet Or Chuck To Hold Onto For Proper Attaching. And, This Durable, Grinding Stone Can Be Cleaned And Restored To Its Original Shape After Extended Use, Longer Tool Life And More Efficient Grinding. Wide Compatibility - Features A 1/8 Inch Shank, Making The Grinding Stone Suitable For Most For Dremel Rotary Tool, And Other Electric Drills, Cordless Drills, Die Grinders. Multipurpose To Have In Your Toolbox - Its Useful To Have A Variety Of Grinding Stones In Your Toolbox. These Sanding Bits For Dremel Rotary Tool Are Great