This is the JConcepts 5mm Turnbuckle Wrench.

FEATURES: Aluminum construction Ideal for the JConcepts 1/8 scale Fin titanium turnbuckles Compact size fits anywhere in racer's toolbox

INCLUDES: 5mm Turnbuckle Wrench

SPECS: Length: 2.75" (70mm)  

BOX DIMENSIONS: 4.75" W. X .50" H. X 8.50" L. BOX WEIGHT: .03 LBS.