Nut size Number* (inches)
1/4 14 7/16
5/16 16 1/2
3/8 18 9/16
7/16 22 11/16
1/2 24 3/4
*See fixed handle drivers catalog numbers with or without prefix P, HS, A, or AA;
Magnetic nutdrivers with suffix M; and Series 99? blades with prefix 99.