1. 2.3 cm diameter: The twist throttle handle bar is 2.3 cm long and can be easily installed on the handlebars with 2.3 cm / 0.9 inch diameter. 2. Universal thrill grip handlebar: It can be used for various types of electric vehicles regardless of VRLA, lithium batteries, water batteries, dry batteries, and is applicable to 12V 99V electric vehicles of different types. 3. Common wiring method: The green cable is the Hall signal cable of the thumb choke, the red cable is the positive 5V of the thumb throttle, and the black cable is the negative. Be sure to check the wiring of the functional wires of the controller. You cannot simply rely on the color of the controller. A wrong connection will cause damage to the controller or throttle lever. 4. Wide range of applications: The throttle twist grip is suitable for electric bicycles and scooters, fitting most electric bicycles with Hall sensor controller. When installing by non professionals, pay attention to the wiring sequence and do not connect wrongly, otherwise it will easily lead to burning the hall wires.