This is Robart's All-In-One Prop Wrench.
FEATURES: Heat treated tough and plated for long life.
Has both inch and metric sizes replacing twelve standard wrenches:
Inches: 5/8, 1/2, 7/16, 9/16, 3/8, 5/16
Metric (mm): 8, 10, 13, 11, 12, 14
The All-In-One design helps to end flight box clutter.
Its large size is easy to see and hard to lose.
The thin profile works on all types of prop nuts.
Use two of these wrenches for jam nut applications.
Its extra long for extra torque.
INCLUDES: One Prop Wrench
SPECS: Length: 8" (20.3cm)