Features: 1.Precise time keeping, glow in dark,it can help you to see the time clearly even at night. 2. Come with an anti-skip rubber mat and split ring mount for easy installation on straight section of handlebar. 3.Mounts on straight section of handlebars with a stainless steel screw. 4.Made of aluminum alloymaterial withelectroplating surface,corrosion resistant and glossy. 5.The clock dialiswaterproof and shock resistant, very durable in using. Specifications: Material: Aluminum Alloy+ Electroplating Surface Optional Color: White / Black Clock Size(Dia. x H): 4.2 x 2cm / 1.65'' x 0.79'' Fitment:For 7/8" 1" Handlebar(22mm, 25mm) Package List: 1 x Clock(Built in battery) 1x Anti-skip Rubber Mat 1xAllen Wrench Note: 1. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. 2. Please check and confirm the size before purchasing. Thanks!