Jmt Sports Camera Handlebar Seatpost Rack Mount Compatible Gopro Hd Hero 2 3 Brand new and high quality. Easy to install & remove. Light weighted and portable. Material: plastic, metal. Color: black. Compatible with Gopro Hero 3/2/1. Suitable for tubes diameter of 1.9cm-3.5cm. Size: 8cm x 8cm x 2cm.