28212 Features: -Bur sphere.-High quality.-Long wearing diamond bur.-Coating over stainless steel to provide uniform cutting on variety of materials glass, ceramics, porcelain, stones, non-ferrous metals and steel (even chrome cobalt alloy).-Shank size: 0.93". Color/Finish: -Shape, grind, finish and engrave with precision. Dimensions: -Overall dimensions: 0.39" H x 3.54" W x 3.14" D, 0.2 lbs.