Wingsmoto Thumb Throttle with Dual Brake Lever Assy for 50cc 90cc 150cc 250cc ATV Quad Roketa Taotao Sunl Kazuma fit 7/8" diameter handle bar Adjustable set screw to regulate throttle range of motion only compatible with dual drum brake systems, not compatible with front disc brake systems with parking brake button brake lever length: 5.7"(145mm)