Makita Part 323016-A</br>For use on small grinders that have an M10 Spindle Diameter and a 1.5 Spindle Thread Pitch.</br>Allows the use of cups or wheels with a 5/8" Arbor Hole Diameter and 11 UNC  Thread Pitch.</br>Heave Duty quality construction</br>Note: For grinders with an M10 Spindle Diameter and 1.25 Thread Pitch use 323015-A</br></br>Product Description</br></br>Adaptor 5/8"-11 Arborto M10x1.50</br><br/>http://www.amazon.com/gp/product/B0007ZNKPK