Use the PWR Brakeboss Extension Mount to attach your Lighthead to the front frame of your bike. Key Features: Mounting: Fits 22.2mm bars up to oversize bars 35mm in diameter.,Thumbscrew: Allows for tightening by hand, or for additional tightening use Allen key.,Spacers: 3 size spacers to allow mount to fit various bar sizes.,. Specification: Mounting: Attaches PWR light head to handlebars and brake boss.,Cable Length (stretched): 80cm.,Compatibility: Compatible with the PWR Road, PWR Trail and PWR Mountain light heads..