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Specification: Material: High carbon steel Color: Black (as pictures shown) Weight: 0.24 pounds Type: Hex shank Drill Bit Hardness: 50 HRC Chamfer Angle: 90° Shape: 5 flute Quantity: 3 Pieces Surface treatment:Titanium Coated Handle diameter: 1/4 inch hexagonal handle Size: 12mm(1/2''), 16mm(5/8''), 19mm(3/4'') Features: Suitable for all Woods and Soft Metals. Fast Changing with a 1/4" Quick Chuck System. High hardness, fast cutting, wear high temperature. 90°angle on the point for sharp and precise countersinking. 1/4 inch quick change hex shank, five-blade chamfering with a groove. 3 sizes in one drill bit set(12/16/19mm), which meet your different needs perfectly. Size includes: 1 x 12mm Drill 1 x 16mm Drill 1 x 19mm Drill