These are Unassembled Universal Plate Sets from|
Tamiya's Educational Construction Series.
Universal plates can be used in a variety of projects including
their use as a base for a chassis.
The plates have 3mm holes that are spaced 5mm apart for use with
other Tamiya Construciton materials.
Illustrated assembly guide.
(2) Universal Plates
(4) Shaft Mounts
(4) Angle Brackets
(18) Push Pins