Jumbo 2-1/8" diameter gauge for easy viewing Fits Harley & Metric Models Simply attach with one screw to your brake or clutch perch clamp. (Metrics and perch clamps with recessed bolts may require additional extended bolt and spacer 691-589 Comes complete with mount and installed jumbo clock Swivel head allows for position adjustment and locking in place Also great on windshields or just about any place you can bolt to Long lasting batteries Perfect for the rider who needs a little extra gauge size for easier viewing All units are waterproof, shock resistant and have glow in the dark elements (glowing elements require reasonable exposure to light for activation)