Features：
1. The portable size makes it easy to carry along.
2. The retractable spring could do a great job.
3. This ball shape spring lock comes with delicate workmanship.
4. Made of ABS, it is sturdy and durable
5. A good accessory for indoor cycling bikes.

Specification：
Material: Steel and ABS
Color: Black and Yellow
Screw Diameter: M16 x 1.5
Screw Length: 20mm/0.79"
Shaft Length: 13mm/0.51"
Total Length:82mm/3.23“
Shaft Diameter: 8mm/0.31"
Max Diameter: 49mm/1.93"

Package Included:
1pcs x Pull Pin Spring Knob