The adapter is the International standard (51mm) To Post Mount (74mm)XTR
Brake pads【Adjust Tightness】Allows adjust the tightness, left and right width. Light alloy disc brake device, durable and useful.【Strong Control】With strong braking force, smooth and stable control. Excellent heat dissipation effect. Easy to install on your bike.【High Quality】Surface ground both sides for ultra-flat braking surface, high grade warp resistant Aluminum alloy.