Brand Name: Diablo *Drill Size: 1 in. *Overall Length: 3-1/2 in. *Material: High Speed Steel *Product Type: Forstner Drill Bit *Shank Type: Round Shank *Number in Package: 1 pc *Packaging Type: Carded *Shank Diameter: 3/8 in. *Discovery -Express,  Convenience, Core,  Super,  Other