Item Type: Quick Release Plate Material: Aluminum Alloy Gross Weight: 136g / 4.8oz Package List 1 x Quick Release Plate with Built in Bubble Level 13/8in and 1/4 in Screw Hole: It is equipped with 1/4 inch and 3/8 inch screw holes, 1/4 inch and 3/8 inch conversion nuts, and can be connected to the tripod to connect the camera. 2Built in Bubble Level: There is a built in bubble level gauge with standard scale, which is easy to observe whether shooting horizontally or vertically. 3Quick Release and Lock: Camera tripod mount adapter plate has anti skid locking functions, quick loading and quick release, convenient to use and install. 4Aluminum Alloy: This quick release plate is made of aluminum alloy with CNC processing and anodic oxidation resistant surface, durable, anti wear and anti corrosion. 5Easy to Use: The knob type operation design makes this quick release plate easier to install on the ball head, bracket, tripod and other accessories.