These are Mini E-Z Connectors for Park Flyers by Dubro.
FEATURES: Aluminum Construction
INCLUDES:
Two Connectors Two Screws Two Washers
REQUIRES: Nothing
SPECS:
Length: 4.8mm (3/16") Diameter: 3.2mm (1/8") Weight: 0.25g (0.0088oz)
COMMENTS:
Maximum pushrod diameter is .047 - 3/64" (1.22mm)