.312" x .437" HSS Step Drill for Rosan Fastener RCDC28-312 MF0050463

Diameter 1 .312" +.002" / -.000"

Diameter 2 .437" +.002" / -.000"

Length of Flute 4.250" +/-.125"

Overall Length 5.750" +/-.125"

For Thread Size .375-16