P drill bit size

P drill = .3230 in = 8.20 mm. Closest metric drill: 8.2 mm.

Nearby drill sizes

Drill	Type	Inch	mm	Difference
19/64	fraction	.2969 in	7.541	-26.1 thou
N	letter	.3020 in	7.671	-21.0 thou
5/16	fraction	.3125 in	7.938	-10.5 thou
O	letter	.3160 in	8.026	-7.0 thou
P	letter	.3230 in	8.204	0.0 thou
21/64	fraction	.3281 in	8.334	5.1 thou
Q	letter	.3320 in	8.433	9.0 thou
R	letter	.3390 in	8.611	16.0 thou
11/32	fraction	.3438 in	8.731	20.7 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.