Malco 1/4 in. and 5/16 in. Reversible Hex Chuck Driver MSHC - The Home Depot
Hilmor Reversible Magnetic Nut Driver Multi Pack (2.75", 4", 6")
2-in-1 Nut Driver, Hex Head, 1/4-Inch and 5/16-Inch - 65064 | Klein Tools
The Malco C-RHEX - Cleanable, Reversible Hex Drivers | The C-RHEX is a must have for any busy trade pro - allowing you to flip between hex driver sizes in seconds! http://bit.ly/CRHEX
Dewalt 1/4" 5/16" Reversible Nut Driver - White Cap
Malco C-rhex 5-Piece Standard (SAE) Hex Nut Driver Set in the Nut Driver Sets department at Lowes.com
C-RHEX® Cleanable, Reversible Magnetic Hex Drivers (1/4″ and 5/16″) - Malco Products
Malco C-rhex 5-Piece Standard (SAE) Hex Nut Driver Set in the Nut Driver Sets department at Lowes.com
MSHLC - Malco MSHLC - 1/4" and 5/16" Reversible Magnetic Hex Chuck Driver (2-3/4" Long)