QR LOCKS FOR WHEELS - Quick-Release 2-Pack: Locks for Wheels - Replaces the quick release skewer - Fits standard wheels - Easy one-time installation - Front Skewer 125mm, 33g - Rear Skewer 168mm, 37g - coded key included - Wheel locks - Front wheel locking skewers 125 mm M5 - Rear wheel locking skewer – 160 mm M5 - Coded key Pinhaed - Each Pinhead key has a 9 digit key code. Keep your key code in a safe place and register it online at: www.pinheadlocks.com