This is a package of DUBRO wheel collars generally used to secure the wheels
on the axles on an airplane but can be used for other applications as well.

Features

Plated brass
Uses a set screw to lock collar to the axle

Includes

Twelve wheel collars
Twelve 6-32 set screws
One 1/16" allen wrench

Specifications

inside diameter - 5/32"
outside diameter - 5/16"
thickness - 7/32"