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Specifications: Material: High Speed Steel Hardness: HRC48-50 Size: 1/4 inch (6.35 mm), 5/16 inch (7.94 mm), 3/8 inch (9.5 mm), 1/2 inch (12.7 mm) Clamp Shank Diameter: 0.7 inch (19 mm) Round Drilling Core Length: 8.3 inches (210 mm) Package Includes: 4 mm)