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Anti-theft protection: 7-lobe pin improved safety, prevents the removal of the wheels with your hands. (7-lobe wrench attached) [Upgraded Design] Specially designed fixed spring mechanism that securely holds the springs in place during tire change and other maintenance tasks. DURABLE: high quality quick release ensures long time use [Size] Spike: front: 112mm/Rear: 148mm; Binding screw: M6 x 45mm If you have lost your key, you can buy our product with ASIN:B0BYSGQCT5. Make sure you can continue to use your locking skewer.