This is the Integy Team Standard Hex Socket Set.  This set of three nut drivers includes a 3/16", a 1/4", and one 11/32" driver.

Features:

• Purple anodized aluminum handels are knurled for a sure grip
• Steel shaft keys into the handle and are secured with a set screw

Includes:
One 3/16" hex socket (nut driver)
One 1/4" hex socket (nut driver)
One 11/32" hex socket (nut driver)

Specifications:
Length: 5.85" (149mm)
Diameter: .70" (18mm) handle