This is a 3mm Ball Wrench (4mm Socket Head) from Dubro.

FEATURES: Fits 4mm socket head. The perfect tool for getting at those hard to reach places. Ball wrenches make it possible to turn socket head screws or bolts from any angle. Transparent Red plastic handle.

INCLUDES: One 3mm Ball Wrench (4mm Socket Head).

SPECS: Length: 5-1/2" (14.0cm) ir/kh  

BOX DIMENSIONS: 1.63" W. X .63" H. X 5.63" L. BOX WEIGHT: .04 LBS.