Giant Numen+ Link OD1 Conical Spacer Mount Description: This Conical Spacer Mount was built specifically to fit within headset stack spacers to offer a sleek position to which users can mount Giant Numen+ Link headlights on Giant Bicycles models with an OD1 style steerer tube configurations. Features: Conical shaped spacer for use with Numen+ integrated lights Magnetic attachment retains lights dutifully Compatible with Giant OD1 (OverDrive) 1-1/8" steerer tubes