This system's square rivets which sit in square drive pockets between the disc blade and the hub allow the blade to expand and contract freely under heavy braking conditions which prevents the rivets from jamming. Rivet locking occurs when the discs heat up during heavy braking and the disc blades come into contact with the rivets (normally circular in shape) which are located between the blade and the central hub. This new EBC system completely eliminates this problem which is responsible for 100% of brake rotor damage caused by brake distortion and vibration. Open since January 2004, AGPL Motorcycle Parts is a recognized specialist in motorcycle recovery and in the sale of used or new spare parts that can be adapted. You have a period of 14 days from the date of rec.