With red safety pin prevent slipping accidentally which can keep your camera camcorder safe With bubble level to help you indicate how much of your tilt Mat rubber on the surface prevent camera wearing, compatible for Manfrotto 501HDV 503HDV 701HDV 577/519/561/Q5 The locking button makes the quick release plate more stable and prevents the loss and sliding Hole in the adapter plate allows more connection possibilities Product Description Note: The camera, tripod head and tripod are not included. Description: This quick release adapter allows your camera to attach to tripod and monopod safely and quickly. Red safety pin prevents slipping accidentally which can keep your camcorder and camera safe. With bubble level to help you indicate how much of your tilt. Rubber mats on the surface prevent scratching on the camera. The locking button makes the quick release plate more stable and prevents loss and slipping. The holes in the adapter plate allow more connection possibilities. Specification: Material: Aluminum alloy 1/4" and 3/8 " Screws Package Contents: 1* Quick Release Plate Adapter 1* Quick Release Plate