Add adjustability with the addition of knuckle at head. Knuckle tilts 210° and rotates 360°. Patented "pinch design" (US patent 5,465,932) prevents the flex shaft from coming loose from the base. Double wound shaft and vinyl covered for maximum rigidity and protection. AMPS-NEC Compatible head plate hole pattern. Available in 14" (355.6mm) 797-14 overall length ONLY