Axiom Trekk Seat Clamp CollarMount a rack to any bike with this lightweight adapter that adds two M5 threaded mounting eyelets to almost any frame.Details:Construction: Forged aluminum.Mounting System: Replaces stock seatpost collar found on most bikes.Features: Clamp design minimizes stress on frames and seatposts. Ideally suited to bicycles with alloy or steel seatposts. Creates two 5mm ucpper rack eyelets on almost any frame.Product: 255120