GEEDIAR 16 17 or 18 Teeth Single Speed Bike Bicycle Compatible with Shimano Type

COMPATIBILITY:  easily to be removed or installed by freewheel tool. Inner diameter 34mm.
Choices: Chain compatibility: 1/2"x1/8" . Teeth: 16.
QUALITY: Made of high quality hardened steel. Tough and long lasting.
BEARINGS: Quality ball bearings which rolls smoothly.