• Ensures perfect tension for your bike chain to make you pedal with less efforts
• Made of high-strength aluminum alloy and quality ceramic bearing, ensuring long-term durability
• It is a great accessory for driving enthusiasts

Specification:

• Material: High-strength 7075 aluminum alloy + ceramic bearing
• Applicability: guide wheel screws with 4/5/6mm axis
• Weight: about 7.2g