What's in the box:

Andoer Bike Mount Holder Handle Bar Computer Mount 25.4mm / 31.8mm for GARMIN Edge 200/500/510/800/810 GPS (Standard)

Features:
Rock solid, stiff & secure grip. Easy to fit - no need to remove tape/grips/levers etc., simply opens up and you bolt on with a hexagon wrench.
This is not the inferior cheaper style that snaps when you do this, or in cold weather!
Sits in front of your stem/bar so you can look at your Garmin easily, keeping your eyes on the road/trail as well.
Compatible with computers with 1/4" turn twist lock interface. Basically it's used for Garmin with 1/4" turn twist lock surface.
The clamp size of this GPS mount is 31.8mm for handlebar. What's more, the inserted spacer to make it also fit 25.4mm diameter handlebar.
Compatible for Garmin Edge series 200, 500, 510, 800, and 810 bike computers.

Specifications:
Brand: Andoer
Material: Plastic
Color: Black
Clamp Dia.: 25.4mm & 31.8mm
Compatibility: For Garmin Edge series 200, 500, 510, 800, and 810 bike computers
Product Dimensions: 14.2cm / 5.6in(Length); 5cm / 2in(Width)
Product Weight: 43g / 1.5oz
Package Size: 14.5 * 5 * 4.3cm / 5.7 * 2 * 1.7in
Package Weight: 60g / 2.1oz

Package List:
1 * Bike Mount Holder
1 * Spacer
2 * Hexagon Wrench