Description The item is a simple and practical mount base plate round with the diameter from 30mm to 31.8mm, which is mainly made of durable aluminum alloy material, and specially designed for attaching your camera on the bicycle's handlebar. With easy to install and durable to use, it is really a wonderful bike mount base plate for choice. Features - Model: ST-87.- Color: mainly black.- Material: durable aluminum alloy.- Inner diameter: about 30-31.8mm.- and Bike Handlebar Mount Aluminum Alloy Base Plate Round.- Compatible with Hero3+ /Hero3 /Hero2 /Hero Cameras.- for attaching your camera on the handlebar of your bicycle.- Compact size, excellent quality, durable and convenient to use.Packing list: 1 * ST-87 Bike Handlebar Mount Aluminum Alloy Base Plate Round for Hero3+ /Hero3 /Hero2 /Hero Camera (Black)