D Drill Size

A D letter drill is 0.2460" (6.248 mm).

Closest fraction: 1/4 (0.2500", over by 0.0040").

Next size down / up

Drill	Inch	mm
C	0.2420	6.147
1/4	0.2500	6.350

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