4 Bur Hole Drill Set: (left to right)

• 1.6mm

• 2.3mm

• 2.9mm (325 grit)

• 3.3mm (600grit)

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  *Using the 1.6mm bur to drill a pilot hole, you progessively use the larger burs to enlarge the hole. The last two burs are finer grits and you are left with a 3.5mm hole @ a 600 grit finish ready for polishing.