Knuckle guard to protect the rider's fists and fingertips from the wind. ShieldBody is made of Polycarbonate and is available in [Color] Clear and [Color] Smoke. The mounting bracket is strong enough to prevent wobble even under high wind pressure, and the bolt-on design allows you to simply tighten the bracket to the mirror in Quantity:Pair (for Left and Right).. The Clutch Side is a bracket shape that matches the shape of the Master Cylinder and plays a role in preventing rotation.. The Brake Side also plays a role to stop the rotation by the bracket shape that matches the shape of the Master Cylinder as well as the Clutch Side..