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HH Knife Burs, also known as Lens cut are made of Tungsten Vanadium and are available in sizes from 0.9mm to 10.0 mm The sizes of 0.9 to 3.0 are sold only in packages of 6. Larger sizes 3.5;5.0;6.0;7.0;8.0;10.0 are priced and sold individually. The knife edge is extremely useful for channel setting stones.
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