What's in the box:

DM-55 Clamp and QR Quick Release Plate with Gradienter for 55mm Ball Head Arca Swiss RRS Wimberley (Standard)

Features:
All-metal materials, CNC precision machining, surface oxidationtreatment
Standard 3/8'' threads, can be directly mounted on 3/8 thread of devices, such as monopod.
Fast loading base with antiskid lock function.
Add 1/4'' conversion thread to be directly connected to the ordinary camera.
With gradienter and scale plate, convenient for use.
Jaw can be opened from 37mm to 42mm, it will accommodate any Arca style plate such as, RRS, Wimberley, Jobu Design, Arca Swiss, Kirk Enterprises, Markins, etc.

Specifications:
Material: Metal
Color: Black
Item size: 9.8 * 5.5 * 2.5cm / 3.9 * 2.2 * 1.0in
Item weight: 114g / 4.02oz

Package List:
1 * DM-55 Clamp and QR Quick Release Plate