Features: The stainless steel flats Head D shafts D rings screw features quick press installation design and universal 1/4" thread, for DSLR tripods, monopods, and telescope QR plates. precisions engineered with corrosion resistant stainless steel and antislip POM materials, this head screw ensures smooth rotation and performances in photographic equipment. for professional photographers, astronomys enthusiasts, and videographers requiring secure mounting for DSLR cameras, lens, and telescopic devices. for stabilizing ball heads on ruggeds terrain, attaching lens collars during studio shootings, or securing QR plates to monopod setups in outdoor. Its flush mounted D rings and shafts provide not tool operations while preventing accidental loosening, ensuring equipment safety during dynamic shootings. Specifications: Materials: Stainless Steel Size: as picture show Package Includes: 1PC D rings 1/4inch Screw note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.