This is the Factory Team 8mm Nut Driver from Team Associated.

FEATURES: Aluminum handle with printed-on driver size for easy identification

INCLUDES: Factory Team 8mm Nut Driver

SPECS: Total Length: 6.7" (170mm) Handle Diameter: 0.68" (17.2mm)  

BOX DIMENSIONS: 3.25" W. X .75" H. X 8.50" L. BOX WEIGHT: .12 LBS.