Shkglowhandlebarclock Super Motorcycle Bicycle Flow in the Dark Bright Handlebar Clock. Glows in the Dark. Fits 7/8" and 1" handlebars, also fits 1 1.8" Bars. Great for motorcycles, bicycles, ATV's, anything that moves. Waterproof professionally polished aluminum mount. Fits over the bar like a saddle. Easy Installation. Secured by a discreet, stainless steel set screw style clamp Clock has Quartz movement made by Seiko Precision Inc., glass crystal. Size: 2 1/8" total Diameter, Clock Diameter 1 5/8"