Salsa Deadbolt Ultralight Thru-Axle Rear 12mm Axle Diameter 167mm Length 1.5 Thread Pitch 20mm Thread LengthSalsa Deadbolt Ultralight Thru Axle Rear 12mm Axle Diameter 167mm Length 1. 5 Thread Pitch 20mm Thread Length. 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 Designed to fit all current Salsa thru axle frames For other frames check with the manufacturer for compatibility and other specifications 6mm hex wrench required