This is the DuraTrax Flywheel Wrench.

FEATURES: Safely and easily holds flywheel of R/C vehicles making tightening and loosening clutch nuts easy and eliminating the stress to internal engine components Slotted to fit 2-, 3-, or 4-pin flywheels Opposite end is a 17mm wrench for wheel nuts used on 1/8 scale monster trucks and buggies Chrome plated stamped steel

INCLUDES: One DuraTrax Flywheel Wrench

SPECS: Length: 5.1" (130mm)  

BOX DIMENSIONS: 4.00" W. X .38" H. X 4.00" L. BOX WEIGHT: .15 LBS.