This is the Factory Team 3/16" Nut Driver Bit from Associated.

FEATURES: Fits 1/4" driver handle Steel construction

INCLUDES: 3/16" Nut Driver Bit

REQUIRES: Installing in handle

SPECS: Length: 2.9" (75.5mm) Nut Driver Size: 3/16" lmm 6.8.11  

BOX DIMENSIONS: 1.88" W. X .38" H. X 3.25" L. BOX WEIGHT: .03 LBS.