Precision CNC machined of light and durable 7000-series aluminum with a fine anodized finish, and 100% made in the USA, Thomson's Seatpost Collar is a beautiful upgrade for your bicycle. It features their bolt, washer and barrel nut combination that allows float on both sides of the collar slot for consistent clamping force. Plus the bolt-hole angle, the collar's 12.7mm inside height and the offset slot, ensure optimum seatpost clamping force at only 25 inch pounds of torque to protect your precious frame and seatpost.