At present, cylindrical grind wheels or wheels having simple profiles are dressed by means of diamond-single-grit dressers, diamond-multiple-stone-dressers, or by means of diamond-dressing plates, in a tolerance range of +/-0.05 mm. 
For higher precision requirements like +/-0.005mm and especially for complicated profile shapes, the dressing of grinding wheels can be accomplished only by highly precise diamond rolls. 
Diamond rolls are primarily used for manufacture in large series. 
Diamond dressing rolls are divided into two series:

Diamond Profile Roller 
Advantages: 
Quick transfer of difficult profile shapes onto the grinding wheel for series production. 
Possibilities of automating the dressing process 
Production of a large number of workpieces with very narrow and uniform tolerances 
Low dressing costs for each workpiece due to the long using life of diamond profile rolls. 
Minimization of reject rate due to reproducible manufacturing tolerances. 

Diamond Form Roller 
Advantages: 
Quick transfer of most different profile shapes to ceramic grinding wheels 
No problems in case of changes of profile shape, as only the grinding wheel has to be newly profiled. 
Low production costs for small numbers of workpieces 
Low dressing costs due to long using life of diamond form rolls. 
Repeated re-profiling is possible.