Fits Starrett A6 Kwik Change Arbor SystemArbor Pairing: For A6 Kwik-Change arborPilot Drill Types: HSSBody Material: SteelCountry of Origin: CN Specifications Hex Shank Size metric: 6,35mm Hex Shank Size imperial: 1/4" Length metric: 119mm Length imperial: 4,11/16"