Alfa Tools CR54553 5/8" x 1/2" High-Speed Steel Car Alignment Reamer High speed steel eco Pro car reamer, left hand helix, 3 flats on shank 5/8" reamer size (0.6250 decimal equivalent) 1/2" shank diameter, 5/16" point diameter 4-1/4" flute length, 6-9/16" Overall length 1 per pack