These 1.70mm diameter, vanadium steel, cup burs eliminate the clogging that plagues many other cup burs. Feature smooth, tooth-free inner cups that round prongs by burnishing rather than cutting, allowing you to finish and polish prongs at the same time.  There are 2 slits in the head for allowing metal particles to escape. Save you from having to waste time cleaning out burs. Last much longer than standard cup burs. Sold in packages of 6.  Made in Germany.

Available in other sizes from 0.90mm to 2.30mm and also available in a Set of 1 each of these 6 sizes: 1.00, 1.20, 1.40, 1.60, 1.80 and 2.10mm.