Kemper hole cutters are sharpened polished brass and are set in smooth hardwood handles. These ceramic tools can easily make clean holes in wet thick-wall greenware and heavy clay.
 
The wonderful Kemper Tools company are, sadly, having to close down.  
These are our last stock of the Kemper Hole Cutters HC1, HC1A, HC2. - UPDATE - They 'may' have a sale of the company lined up! All going well, the Kemper Co. will still be in business.