These are the Dubro Mini E/Z connectors for slow flying aircraft.

Features

Lightweight aluminum E/Z connectors.
Steel screws and black nylon washers to secure connectors.

Includes

Twelve E/Z connectors
Twelve screws
Twelve black rubber washers

SPECIFICATIONS:
Length: 4.8mm (3/16")
Diameter: 3.2mm (1/8")
Weight: 0.25g (0.0088oz)