This is the Factory Team .050" Hex Driver Bit from Associated.

FEATURES: Fits 1/4" driver handle Steel construction

INCLUDES: .050" Hex Driver Bit

REQUIRES: Installing in handle

SPECS: Length: 2.9" (75mm) Hex Driver Size: .050"  

BOX DIMENSIONS: 3.00" W. X .25" H. X 3.25" L. BOX WEIGHT: .02 LBS.