Schrader valves are commonly found on bicycle tires and are easy to use and reliable. Plastic - Indicates that the wheel is constructed primarily of plastic.
Plastic wheels can offer advantages such as lightweight construction and resistance to corrosion. FREEWHEEL SINGLE 18T X 1/8 8-KEY RELEASE LM08 Chrome. Single - Indicates that this freewheel is designed for use on a single-speed bicycle, meaning it does not have multiple gears. 18T x 1/8 Inch - Specifies the size of the cvintage on the freewheel.In this case, it has 18 teeth (T) and is compatible with a chain designed for a 1/8 inch width. 1.37x24 TPI - Indicates the threading specifications for installation. In this case, it has a thread pitch of 24 threads per inch (TPI) and a diameter of 1.37 inches.
This size is compatible with the standard threading found on many bicycle hubs. 8-key Release - Refers to the mechanism used to attach and remove the freewheel from the hub. An 8-key release likely means it requires an 8-pronged tool for installation and removal.