Vacuum Brazed diamond burs are used for engraving and grinding stones. With vacuum brazed technology, diamonds are 90% exposed like electroplated diamonds to provide super aggressive grinding, yet they are more tightly bonded to provide much longer life.
The set comes with 20 pcs of diamond burs with different shapes, in a solid wood box. Diamonds are 30/40 grit. The diamond burs are sold individually too.