This is a hop-up front upright set for the following Tamiya 1/10 scale cars: the F-1's, the Group C's, the Grasshopper II, the Madcap and the Bear Hawk. "RD" stands for racing developed. Uprights are also called knuckle arms.

PACKAGE INCLUDES:

Front upright with front axle installed (2)
3x28mm Shaft (2)
3mm Grub (or "set") screw (2)
4mm Axle nuts (2)
4mm Brass ball connector (2)
Silver (normal) springs for F-1 cars (4)
Black (stiff) springs for F-1 cars (4)
1.5mm Hex wrench for grub screws (1)
Illustrated instructions for installation

COMMENTS:

The instructions are mostly in Japanese, but the illustrations are
pretty clear.