Solid Carbide Spade drills are designed for drilling shallow holes in steels harder than RC 50 and for thin sheet metal applications. Drill diameter tolerances are +.000 - .0005.
Spade Drills page 120
SIZE DEC. EQUIV. FLUTE LENGTH OVERALL LENGTH
1/16 .0625 5/16 1-1/2
3/32 .0937 7/16 1-1/2
1/8 .1250 1/2 1-1/2
5/32 .1562 9/16 2
3/16 .1875 11/16 2
7/32 .2188 11/16 2-1/2
1/4 .2500 13/16 2-1/2
9/32 .2812 7/8 2-1/2
5/16 .3125 7/8 2-1/2
11/32 .3438 15/16 2-1/2
3/8 .3750 1-1/8 2-1/2
13/32 .4062 1-1/8 2-1/2
7/16 .4375 1-3/16 2-1/2
15/32 .4687 1-3/16 2-1/2
1/2 .5000 1-5/16 2-1/2