COSMOS HEROBMK2 31.8mm V2 Aluminum Handlebar Bike Mount with Premier Cleaning Cloth for GoPro HERO Cameras Mount lBlack Handlebar locks securely around any 30.0 mm to 31.8mm handlebar Made of 100% CNC machined aluminum, precise design eliminates common vibrations and shaking seen in plastic mounts cluded hex key anMade of 100% CNC machined aluminum, precise design eliminad attach to your handlebar Package included: Aluminum Mount + Hex Key For GoPro HERO Cameras HERO2 HERO3