Features: Package Includes: There are 4pcs or 12pcs(optional) bike quick release springs are included, professional replacement spring for quick release hubs. About Size: The size is about 11.3 x 12 x 7.1mm/0.44 x 0.47 x 0.28inch, perfect size, it is easy to carry it. It is convenient and practical to use, lightweight and portable. It is necessary accessories for bicycle hubs. Material: Made of stainless steel, high intensity and high elastic and resistant to high temperatures and abrasion, durable for long time use. Easy To Use: The security skewers bicycle skewer locker is easy to use and universal, high strength, it is suitable for most mountain bicycles. Multi-Purposes: It was used for confirmation strength of quick release effectively and preventing quick release loose and great for bike front rear quick release skewer, skewer shaft, axle fixed rod and etc. Specifications: Item Type: Quick Release Skewers Springs Material: Stainless Steel Color: Silver Quantity: 4Pcs, 12Pcs(optional) Size: About 11.3 x 12 x 7.1mm/0.44 x 0.47 x 0.28inch Package Includes: 4Pcs x Quick Release Skewers Springs Or 12Pcs x Quick Release Skewers Springs Notes: Transition: 1cm=10mm=0.39inch 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement. Customer service online timeBeijing time 9:00-18:00 (working day) If you have any comments,pls contact us at any time,we will do our best to meet your any requirements.