Features: brand new and high quality Made of aluminum alloy material, light weight, high strength and durable. Unique appearance, personality, corrosion-resistant. Easy installation, fit bicycle quick release screw nut, M10x1.0 thread. This serves to distribute the pressure of the nut over the part being secured. Mountain bike road bike fixed gear DIY modified accessories. Specifications: Material: Aluminum Alloy Color: Black/Red/Blue/Golden/Green/Purple Package Weight: approx.6g Thread: M10x1.0 Size: approx.21.8x12mm/0.85x0.47in Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1Pc x Bicycle Axle Track Nut