The KH-6251 is a professional quick-release plate adapter system, which is made of durable aluminum alloy material, and equipped with 1/4 and 3/8 screws to make your camera attaching tripod monopod safely and quickly. With red safety pin to prevent sliding accidentally which can keep your camera and camcorder safe. With 3 bubble levels to help indicate how much of your slanting, for accurate shooting. Rubber mats on surface can prevent wearing of camera, compatible with Manfrotto 501HDV 503HDV 701HDV 577 /519/561/Q5. Locking knob makes quick release plate more stable and prevent loosing and sliding. Specification: Model: KH-6251. Material: Aluminum alloy. With red safety pin prevent sliding accidentally which can keep your camera camcorder safe. With three bubble levels to help indicate how much of your slanting. Rubber mat on surface prevent wearing of camera. Compatible with most DSLR camera camcorder tripods monopods, and also compatible with Manfrotto 501HDV 503HDV 701HDV 577/519/561/Q5. Locking knob makes quick release plate more stable and prevent loosing and sliding. Holes in the adapter plate enables more connecting possibilities. Package Includes: 1x Tripod Quick Release Plate Adapter for Manfrotto Note: Note: Camera and tripods in the pictures are not included