Shimano Brake Pad Spacer for Transport Protection. The placeholder replaces the brake disc during transport without wheels. The spacer maintains the necessary distance between the brake pads. Compatible with many Shimano Hydraulic Disc Brakes including BR-M447, BR-M446, BR-M445, BR-M4050, BR-M395, BR-M355, BR-M3050, BR-T675, BR-T615. Use for when transporting your bike with the wheels taken off. Genuine Shimano Pad Spacer Disc Brake Transport Lock.