Maximum safe speed varies with bur size and is indicated on the box. Use a good lubricant, such as Gesswein Lube-Stick, to facilitate cutting and prolong tool life. Shank is 3/32" diameter and measures approximately 1-3/4" long.
Available in 12 sizes from 0.50mm to 1.60mm diameter. Priced by the piece but sold in twos — please order in multiples of 2.