Our Busch® Twincut Fig. 411T set of 12 is made up of concave, cup shaped burs with twincut blade geometry for quick and precise work. The ideal tool for rounding prongs and wire ends. Made of tungsten vanadium steel for strength and durability. Features precision machined, uniformly spaced teeth for accurate and smooth cutting.  Does not include size 007 nor 019.  Use with a good lubricant such as Gesswein Lube-Stik to facilitate cutting and prolong tool life. The 3/32" shanks measure approximately 1.75" long. Maximum operating speed varies with bur size. Please consult with ANSI (American National Standards Institute) for speed recommendations. Made in Germany.