1 Drill Size

A 1 letter drill is 1.0000" (25.400 mm).

Closest fraction: 1/1 (1.0000", under by 0.0000").

Next size down / up

Drill	Inch	mm
63/64	0.9844	25.003

Printable PDF version - Drill Size Chart
Clean letter-size sheet for the toolbox or shop wall. Instant download, $3.49.