ROUND BURS 005-023 ( 0.05-2.3 MM)    Jewelers burs are made of tungsteen vanadium steel. They have 3/32" (2.35 mm) diameter shanks, are aproximatimately 1-3/4" (44 mm )long and are used with flex shaft machines or micromotors. Please when you order mantion the size of the burs from the folowing sizes. Please note that the first top row is the ISO number  and the second row is the milimiter diameter of the bur. Sold by  the piece. ISO 040 042 045 047 050 Diameter mm 4.0 4.2 4.5 4.7 5.0

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