Diablo  Steel  Round Shank  2-1/8 in. Dia. *Diameter: 2-1/8 in. *Overall Length: 3-1/2 in. *Shank Diameter: 3/8 in. *Shank Type: Round Shank *Product Type: Forstner Drill Bit *Material: Steel *Number in Package: 1 pc. *Packaging Type: Carded *For drilling straight, angled and overlapping holes in all kinds of wood with minimal splintering*Steep angled, double-groundd, razor sharp serrated edges that slice throughout the rotation of the bit for less splintering and chipping