The Deadbolt Ultralight Thru-Axles are offered in a 6mm flat button-head design, for a flush, clean look. Lightweight, easy to use, and secure. - CNC-machined from 7000 series aluminum - One-piece design - Designed to fit all current Salsa thru-axle frames - For other frames, check with the manufacturer for compatibility and other specifications - 6 mm hex wrench required for installation