K drill bit size

K drill = .2810 in = 7.14 mm. Closest metric drill: 7.1 mm.

Nearby drill sizes

Drill	Type	Inch	mm	Difference
17/64	fraction	.2656 in	6.747	-15.4 thou
H	letter	.2660 in	6.756	-15.0 thou
I	letter	.2720 in	6.909	-9.0 thou
J	letter	.2770 in	7.036	-4.0 thou
K	letter	.2810 in	7.137	0.0 thou
9/32	fraction	.2813 in	7.144	0.2 thou
L	letter	.2900 in	7.366	9.0 thou
M	letter	.2950 in	7.493	14.0 thou
19/64	fraction	.2969 in	7.541	15.9 thou

1 thou = 0.001 in = 0.0254 mm. Drills a few thou apart are usually interchangeable for clearance holes, but not for tap drills or reamer pilots.