#80 drill bit size

#80 drill = .0135 in = 0.34 mm. Closest metric drill: 1 mm.

Nearby drill sizes

Drill	Type	Inch	mm	Difference
#80	number	.0135 in	0.343	0.0 thou
#79	number	.0145 in	0.368	1.0 thou
1/64	fraction	.0156 in	0.397	2.1 thou
#78	number	.0160 in	0.406	2.5 thou
#77	number	.0180 in	0.457	4.5 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.