Feature●Size: #21; Material: Cobalt; Finish: Gold;●Flute Length: 2-1/2"; Overall Length: 6";●Shank Type: Round; Style: Aircraft Extension;●Cutting Angle: 135; Point Type: Split Point;●Number of Flutes: 2; Cutting Direction: Right HandDescription Heavy Duty Split Point, Cobalt Steel, 6 Inches Aircraft Extension Drill Bit, Size: 21, Dec. Equivalent .1590, Flute Length 2-1/8, Overall Length 6 Inches