This is the Du-Bro Micro Steerable Tail Wheel.

Features

Mounts to tail of aircraft with CA glue or epoxy
Can be steerable with included steering arm or left free to travel
Constructed of paintable ABS plastic
Hard plastic 1/2" (12.7mm) diameter wheel

Includes

Tailwheel, steering arm, mount

Requires

CA glue (GPMR6002) or Epoxy (GPMR6043)

Specifications

Length of Mount: 1.6" (41mm)
Length of Steering Arm: 1.2" (27mm)
Weight: 0.06oz (1.75g)
Wheel Diameter: 1/2" (12.7mm)