#72 drill bit size

#72 drill = .0250 in = 0.64 mm. Closest metric drill: 1 mm.

Nearby drill sizes

Drill	Type	Inch	mm	Difference
#76	number	.0200 in	0.508	-5.0 thou
#75	number	.0210 in	0.533	-4.0 thou
#74	number	.0225 in	0.571	-2.5 thou
#73	number	.0240 in	0.610	-1.0 thou
#72	number	.0250 in	0.635	0.0 thou
#71	number	.0260 in	0.660	1.0 thou
#70	number	.0280 in	0.711	3.0 thou
#69	number	.0292 in	0.742	4.2 thou
#68	number	.0310 in	0.787	6.0 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.