Busch® 90° hart burs (also known as bearing burs) are useful for cutting stone seats and notching prongs. Set includes 12 burs: sizes 0.7 through 1.8mm.

• 0.7mm 
• 0.8mm 
• 0.9mm 
• 1.0mm 
• 1.1mm 
• 1.2mm 
• 1.3mm 
• 1.4mm 
• 1.5mm 
• 1.6mm 
• 1.7mm 
• 1.8mm